Only those ports that are commonly used are listed; for full list, refer to the IANA port list.[1]
When investigating TCP traffic, be careful not to confuse the client and server ports. The client port is incremental, typically beginning at 1024 at boot time and wrapping at 4096. If the port you are investigating is in the lower part of this range, it may be a client port. Stateful firewalls identify the server port, but packet sniffers and stateless firewalls do not. For example, a packet sniffer showing a TCP packet with source port 1080 and destination port 1494 might be either the SOCKetS or Citrix Independent Computing Architecture (ICA) protocols. The only way to know for sure is to examine the initial TCP handshake.
With UDP, client port selection depends on the application and may be incremental, fixed to a nonsensical value, or fixed equal to the server port.
| Description | Status | |
| 1024/TCP,UDP | Reserved[1] | Official |
| 1025/TCP | NFS-or-IIS | Unofficial |
| 1026/TCP | Often utilized by Microsoft DCOM services | Unofficial |
| 1029/TCP | Often utilized by Microsoft DCOM services | Unofficial |
| 1058/TCP,UDP | nim, IBM AIX Network Installation Manager (NIM) | Official |
| 1059/TCP,UDP | nimreg, IBM AIX Network Installation Manager (NIM) | Official |
| 1080/TCP | SOCKS proxy | Official |
| 1085/TCP,UDP | WebObjects | Official |
| 1098/TCP,UDP | rmiactivation, RMI Activation | Official |
| 1099/TCP,UDP | rmiregistry, RMI Registry | Official |
| 1109/TCP,UDP | Reserved[1] | Official |
| 1109/TCP | Kerberos Post Office Protocol (KPOP) | Unofficial |
| 1111/UDP | EasyBits School network discovery protocol (for Intel's CMPC platform) | Unofficial |
| 1140/TCP,UDP | AutoNOC protocol | Official |
| 1167/UDP | phone, conference calling | Unofficial |
| 1169/TCP,UDP | Tripwire | Official |
| 1176/TCP | Perceptive Automation Indigo Home automation server | Official |
| 1182/TCP,UDP | AcceleNet Intelligent Transfer Protocol | Official |
| 1194/TCP,UDP | OpenVPN | Official |
| 1198/TCP,UDP | The cajo project Free dynamic transparent distributed computing in Java | Official |
| 1200/TCP | scol, protocol used by SCOL 3D virtual worlds server to answer world name resolution client request[27] | Official |
| 1200/UDP | scol, protocol used by SCOL 3D virtual worlds server to answer world name resolution client request | Official |
| 1200/UDP | Steam Friends Applet | Unofficial |
| 1214/TCP | Kazaa | Official |
| 1220/TCP | QuickTime Streaming Server administration | Official |
| 1223/TCP,UDP | TGP, TrulyGlobal Protocol, also known as "The Gur Protocol" (named for Gur Kimchi of TrulyGlobal) | Official |
| 1234/UDP | VLC media player Default port for UDP/RTP stream | Unofficial |
| 1236/TCP | Symantec BindView Control UNIX Default port for TCP management server connections | Unofficial |
| 1241/TCP,UDP | Nessus Security Scanner | Official |
| 1248/TCP | NSClient/NSClient++/NC_Net (Nagios) | Unofficial |
| 1270/TCP,UDP | Microsoft System Center Operations Manager (SCOM) (formerly Microsoft Operations Manager (MOM)) agent | Official |
| 1293/TCP,UDP | IPSec (Internet Protocol Security) | Official |
| 1311/TCP | Dell Open Manage HTTPS | Unofficial |
| 1313/TCP | Xbiim (Canvii server) | Unofficial |
| 1337/TCP | PowerFolder P2P Encrypted File Synchronization Program | Unofficial |
| 1337/TCP | WASTE Encrypted File Sharing Program | Unofficial |
| 1352/TCP | IBM Lotus Notes/Domino Remote Procedure Call (RPC) protocol | Official |
| 1387/TCP,UDP | cadsi-lm, LMS International (formerly Computer Aided Design Software, Inc. (CADSI)) LM | Official |
| 1414/TCP | IBM WebSphere MQ (formerly known as MQSeries) | Official |
| 1417/TCP,UDP | Timbuktu Service 1 Port | Official |
| 1418/TCP,UDP | Timbuktu Service 2 Port | Official |
| 1419/TCP,UDP | Timbuktu Service 3 Port | Official |
| 1420/TCP,UDP | Timbuktu Service 4 Port | Official |
| 1431/TCP | Reverse Gossip Transport Protocol (RGTP), used to access a General-purpose Reverse-Ordered Gossip Gathering System (GROGGS) bulletin board, such as that implemented on the Cambridge University's Phoenix system | Official |
| 1433/TCP | MSSQL (Microsoft SQL Server database management system) Server | Official |
| 1434/UDP | MSSQL (Microsoft SQL Server database management system) Monitor | Official |
| 1494/TCP | Citrix XenApp Independent Computing Architecture (ICA) thin client protocol | Official |
| 1500/TCP | NetGuard GuardianPro firewall (NT4-based) Remote Management | Unofficial |
| 1501/UDP | NetGuard GuardianPro firewall (NT4-based) Authentication Client | Unofficial |
| 1503/TCP,UDP | Windows Live Messenger (Whiteboard and Application Sharing) | Unofficial |
| 1512/TCP,UDP | Microsoft Windows Internet Name Service (WINS) | Official |
| 1521/TCP | nCube License Manager | Official |
| 1521/TCP | Oracle database default listener, in future releases official port 2483 | Unofficial |
| 1524/TCP,UDP | ingreslock, ingres | Official |
| 1526/TCP | Oracle database common alternative for listener | Unofficial |
| 1533/TCP | IBM Sametime IM—Virtual Places Chat Microsoft SQL Server | Official |
| 1547/TCP,UDP | Laplink | Official |
| 1550 | Gadu-Gadu (direct client-to-client) | Unofficial |
| 1581/UDP | MIL STD 2045-47001 VMF | Official |
| 1589/UDP | Cisco VQP (VLAN Query Protocol) / VMPS | Unofficial |
| 1645/TCP,UDP | radius/radacct, RADIUS authentication protocol (default for Cisco and Juniper Networks RADIUS servers) | Unofficial |
| 1627 | iSketch | Unofficial |
| 1677/TCP,UDP | Novell GroupWise clients in client/server access mode | Official |
| 1701/UDP | Layer 2 Forwarding Protocol (L2F) & Layer 2 Tunneling Protocol (L2TP) | Official |
| 1716/TCP | America's Army Massively multiplayer online game (MMO) | Unofficial |
| 1719/UDP | H.323 Registration and alternate communication | Official |
| 1720/TCP | H.323 Call signalling | Official |
| 1723/TCP,UDP | Microsoft Point-to-Point Tunneling Protocol (PPTP) | Official |
| 1725/UDP | Valve Steam Client | Unofficial |
| 1755/TCP,UDP | Microsoft Media Services (MMS, ms-streaming) | Official |
| 1761/TCP,UDP | cft-0 | Official |
| 1761/TCP | Novell Zenworks Remote Control utility | Unofficial |
| 1762–1768/TCP,UDP | cft-1 to cft-7 | Official |
| 1812/TCP,UDP | radius, RADIUS authentication protocol | Official |
| 1813/TCP,UDP | radacct, RADIUS accounting protocol | Official |
| 1863/TCP | MSNP (Microsoft Notification Protocol), used by the .NET Messenger Service and a number of Instant Messaging clients | Official |
| 1900/UDP | Microsoft SSDP Enables discovery of UPnP devices | Official |
| 1920/TCP | IBM Tivoli Monitoring Console (https) | Unofficial |
| 1935/TCP | Adobe Systems Macromedia Flash Real Time Messaging Protocol (RTMP) "plain" protocol | Official |
| 1970/TCP,UDP | Danware NetOp Remote Control | Official |
| 1971/TCP,UDP | Danware NetOp School | Official |
| 1972/TCP,UDP | InterSystems Caché | Official |
| 1975–1977/UDP | Cisco TCO (Documentation) | Official |
| 1984/TCP | Big Brother—network monitoring tool | Official |
| 1985/UDP | Cisco HSRP | Official |
| 1994/TCP,UDP | Cisco STUN-SDLC (Serial Tunneling—Synchronous Data Link Control) protocol | Official |
| 1998/TCP,UDP | Cisco X.25 over TCP (XOT) service | Official |
| 2000/TCP,UDP | Cisco SCCP (Skinny) | Official |
| 2001/UDP | CAPTAN Test Stand System | Unofficial |
| 2002/TCP | Secure Access Control Server (ACS) for Windows | Unofficial |
| 2030 | Oracle Services for Microsoft Transaction Server | Unofficial |
| 2031/TCP,UDP | mobrien-chat—obsolete (ex-http://www.mobrien.com) | Official |
| 2041/TCP | Mail.Ru Agent communication protocol | Unofficial |
| 2049/UDP | Network File System | Official |
| 2049/UDP | shilp | Official |
| 2053/UDP | lot105-ds-upd Lot105 DSuper Updates | Official |
| 2053/TCP | lot105-ds-upd Lot105 DSuper Updates | Official |
| 2053/TCP | knetd Kerberos de-multiplexor | Unofficial |
| 2056/UDP | Civilization 4 multiplayer | Unofficial |
| 2073/TCP,UDP | DataReel Database | Official |
| 2074/TCP,UDP | Vertel VMF SA (i.e. App.. SpeakFreely) | Official |
| 2082/TCP | Infowave Mobility Server | Official |
| 2082/TCP | CPanel default | Unofficial |
| 2083/TCP | Secure Radius Service (radsec) | Official |
| 2083/TCP | CPanel default SSL | Unofficial |
| 2086/TCP | GNUnet | Official |
| 2086/TCP | WebHost Manager default | Unofficial |
| 2087/TCP | WebHost Manager default SSL | Unofficial |
| 2095/TCP | CPanel default Web mail | Unofficial |
| 2096/TCP | CPanel default SSL Web mail | Unofficial |
| 2102/TCP,UDP | zephyr-srv Project Athena Zephyr Notification Service server | Official |
| 2103/TCP,UDP | zephyr-clt Project Athena Zephyr Notification Service serv-hm connection | Official |
| 2104/TCP,UDP | zephyr-hm Project Athena Zephyr Notification Service hostmanager | Official |
| 2105/TCP,UDP | IBM MiniPay | Official |
| 2105/TCP,UDP | eklogin Kerberos encrypted remote login (rlogin) | Unofficial |
| 2105/TCP,UDP | zephyr-hm-srv Project Athena Zephyr Notification Service hm-serv connection (should use port 2102) | Unofficial |
| 2144/TCP | Iron Mountain LiveVault Agent | UnOfficial |
| 2145/TCP | Iron Mountain LiveVault Agent | UnOfficial |
| 2161/TCP | APC Agent | Official |
| 2181/TCP,UDP | EForward-document transport system | Official |
| 2190/UDP | TiVoConnect Beacon | Unofficial |
| 2200/UDP | Tuxanci game server[28] | Unofficial |
| 2210/TCP,UDP | NOAAPORT Broadcast Network | Official |
| 2210/TCP | MikroTik Remote management for "The Dude" | Unofficial |
| 2211/TCP,UDP | EMWIN | Official |
| 2211/TCP | MikroTik Secure management for "The Dude" | Unofficial |
| 2212/TCP,UDP | LeeCO POS Server Service | Official |
| 2212/TCP | Port-A-Pour Remote WinBatch | Unofficial |
| 2219/TCP,UDP | NetIQ NCAP Protocol | Official |
| 2220/TCP,UDP | NetIQ End2End | Official |
| 2222/TCP | DirectAdmin default & ESET | Unofficial |
| 2223/UDP | Microsoft Office OS X antipiracy network monitor | Unofficial |
| 2301/TCP | HP System Management Redirect to port 2381 | Unofficial |
| 2302/UDP | ArmA multiplayer (default for game) | Unofficial |
| 2302/UDP | Halo: Combat Evolved multiplayer | Unofficial |
| 2303/UDP | ArmA multiplayer (default for server reporting) (default port for game +1) | Unofficial |
| 2305/UDP | ArmA multiplayer (default for VoN) (default port for game +3) | Unofficial |
| 2369/TCP | Default for BMC Software CONTROL-M/Server—Configuration Agent, though often changed during installation | Official |
| 2370/TCP | Default for BMC Software CONTROL-M/Server—to allow the CONTROL-M/Enterprise Manager to connect to the CONTROL-M/Server, though often changed during installation | Official |
| 2381/TCP | HP Insight Manager default for Web server | Unofficial |
| 2401/TCP | CVS version control system | Unofficial |
| 2404/TCP | IEC 60870-5-104, used to send electric power telecontrol messages between two systems via directly connected data circuits | Official |
| 2420/UDP | Westell Remote Access | Official |
| 2427/UDP | Cisco MGCP | Official |
| 2447/TCP,UDP | ovwdb—OpenView Network Node Manager (NNM) daemon | Official |
| 2483/TCP,UDP | Oracle database listening for unsecure client connections to the listener, replaces port 1521 | Official |
| 2484/TCP,UDP | Oracle database listening for SSL client connections to the listener | Official |
| 2500/TCP | THEÒSMESSENGER listening for TheòsMessenger client connections | Official |
| 2546/TCP,UDP | EVault—Data Protection Services | Unofficial |
| 2593/TCP,UDP | RunUO—Ultima Online server | Unofficial |
| 2598/TCP | new ICA—when Session Reliability is enabled, TCP port 2598 replaces port 1494 | Unofficial |
| 2612/TCP,UDP | QPasa from MQSoftware | Official |
| 2700–2800/TCP | KnowShowGo P2P | Official |
| 2710/TCP | XBT Bittorrent Tracker | Unofficial |
| 2710/UDP | XBT Bittorrent Tracker experimental UDP tracker extension | Unofficial |
| 2710/TCP | Knuddels.de | Unofficial |
| 2713/TCP,UDP | Raven Trinity Broker Service | Official |
| 2714/TCP,UDP | Raven Trinity Data Mover | Official |
| 2735/TCP,UDP | NetIQ Monitor Console | Official |
| 2809/TCP | corbaloc:iiop URL, per the CORBA 3.0.3 specification | Official |
| 2809/TCP | IBM WebSphere Application Server (WAS) Bootstrap/rmi default | Unofficial |
| 2809/UDP | corbaloc:iiop URL, per the CORBA 3.0.3 specification. | Official |
| 2868/TCP,UDP | Norman Proprietary Event Protocol NPEP | Official |
| 2944/UDP | Megaco Text H.248 | Unofficial |
| 2945/UDP | Megaco Binary (ASN.1) H.248 | Unofficial |
| 2948/TCP,UDP | WAP-push Multimedia Messaging Service (MMS) | Official |
| 2949/TCP,UDP | WAP-pushsecure Multimedia Messaging Service (MMS) | Official |
| 2967/TCP | Symantec AntiVirus Corporate Edition | Unofficial |
| 3000/TCP | Miralix License server | Unofficial |
| 3000/UDP | Distributed Interactive Simulation (DIS), modifiable default | Unofficial |
| 3001/TCP | Miralix Phone Monitor | Unofficial |
| 3002/TCP | Miralix CSTA | Unofficial |
| 3003/TCP | Miralix GreenBox API | Unofficial |
| 3004/TCP | Miralix InfoLink | Unofficial |
| 3005/TCP | Miralix TimeOut | Unofficial |
| 3006/TCP | Miralix SMS Client Connector | Unofficial |
| 3007/TCP | Miralix OM Server | Unofficial |
| 3017/TCP | Miralix IVR and Voicemail | Unofficial |
| 3025/TCP | netpd.org | Unofficial |
| 3030/TCP,UDP | NetPanzer | Unofficial |
| 3050/TCP,UDP | gds_db (Interbase/Firebird) | Official |
| 3051/TCP,UDP | Galaxy Server (Gateway Ticketing Systems) | Official |
| 3074/TCP,UDP | Xbox LIVE and/or Games for Windows - LIVE | Official |
| 3100/TCP | HTTP used by Tatsoft as the default listen port | Unofficial |
| 3101/TCP | Blackberry Enterprise Server communcation to cloud | Unofficial |
| 3128/TCP | HTTP used by Web caches and the default for the Squid cache | Unofficial |
| 3128/TCP | HTTP used by Vasavi College of Enginnering, Hyderabad For Proxy Server with IP: 135.135.4.9 for Internet Connection In LAN | Unofficial www.vce.ac.in |
| 3128/TCP | HTTP used by Tatsoft as the default client connection | Unofficial |
| 3225/TCP,UDP | FCIP (Fiber Channel over Internet Protocol) | Official |
| 3233/TCP,UDP | WhiskerControl research control protocol | Official |
| 3235/TCP,UDP | Galaxy Network Service (Gateway Ticketing Systems) | Official |
| 3260/TCP,UDP | iSCSI target | Official |
| 3268/TCP,UDP | msft-gc, Microsoft Global Catalog (LDAP service which contains data from Active Directory forests) | Official |
| 3269/TCP,UDP | msft-gc-ssl, Microsoft Global Catalog over SSL (similar to port 3268, LDAP over SSL) | Official |
| 3283/TCP | Apple Remote Desktop reporting (officially Net Assistant, referring to an earlier product) | Official |
| 3299/TCP | SAP-Router (routing application proxy for SAP R/3) | Unofficial |
| 3300/TCP | TripleA game server | Unofficial |
| 3305/TCP,UDP | odette-ftp, Odette File Transfer Protocol (OFTP) | Official |
| 3306/TCP,UDP | MySQL database system | Official |
| 3333/TCP | Network Caller ID server | Unofficial |
| 3386/TCP,UDP | GTP' 3GPP GSM/UMTS CDR logging protocol | Official |
| 3389/TCP | Microsoft Terminal Server (RDP) officially registered as Windows Based Terminal (WBT) | Official |
| 3396/TCP,UDP | Novell NDPS Printer Agent | Official |
| 3455/TCP,UDP | [RSVP] Reservation Protocol | Official |
| 3423/TCP | Xware xTrm Communication Protocol | Official |
| 3424/TCP | Xware xTrm Communication Protocol over SSL | Official |
| 3478/TCP,UDP | STUN, a protocol for NAT traversal | Official |
| 3483/UDP | Slim Devices discovery protocol | Official |
| 3483/TCP | Slim Devices SlimProto protocol | Official |
| 3516/TCP,UDP | Smartcard Port | Official |
| 3532/TCP,UDP | Raven Remote Management Control | Official |
| 3533/TCP,UDP | Raven Remote Management Data | Official |
| 3537/TCP,UDP | ni-visa-remote | Unofficial |
| 3544/UDP | Teredo tunneling | Official |
| 3632/TCP | distributed compiler | Official |
| 3689/TCP | Digital Audio Access Protocol (DAAP)—used by Apple’s iTunes and AirPort Express | Official |
| 3690/TCP,UDP | Subversion version control system | Official |
| 3702/TCP,UDP | Web Services Dynamic Discovery (WS-Discovery), used by various components of Windows Vista | Official |
| 3723/TCP,UDP | Used by many Battle.net Blizzard games (Diablo II, Warcraft II, Warcraft III, StarCraft) | Unofficial |
| 3724/TCP,UDP | World of Warcraft Online gaming MMORPG | Unofficial |
| 3724/TCP | Club Penguin Disney online game for kids | Unofficial |
| 3784/TCP,UDP | Ventrilo VoIP program used by Ventrilo | Unofficial |
| 3785/UDP | Ventrilo VoIP program used by Ventrilo | Unofficial |
| 3868/TCP,SCTP | Diameter base protocol (RFC 3588) | Official |
| 3872/TCP | Oracle Management Remote Agent | Unofficial |
| 3899/TCP | Remote Administrator | Unofficial |
| 3900/TCP | udt_os, IBM UniData UDT OS[29] | Official |
| 3945/TCP,UDP | EMCADS service, a Giritech product used by G/On | Official |
| 3978/UDP | OpenTTD game serverlist masterserver | Unofficial |
| 3979/TCP,UDP | OpenTTD game | Unofficial |
| 3999/TCP,UDP | Norman distributed scanning service | Official |
| 4000/TCP,UDP | Diablo II game | Unofficial |
| 4007/TCP | PrintBuzzer printer monitoring socket server | Unofficial |
| 4018/TCP,UDP | protocol information and warnings | Official |
| 4069/UDP | Minger Email Address Verification Protocol[30] | Official |
| 4089/TCP,UDP | OpenCORE Remote Control Service | Official |
| 4093/TCP,UDP | PxPlus Client server interface ProvideX | Official |
| 4096/TCP,UDP | Bridge-Relay Element ASCOM | Official |
| 4100 | WatchGuard Authentication Applet—default | Unofficial |
| 4111/TCP | Xgrid | Official |
| 4116/TCP,UDP | Smartcard-TLS | Official |
| 4125/TCP | Microsoft Remote Web Workplace administration | Unofficial |
| 4201/TCP | TinyMUD and various derivatives | Unofficial |
| 4226/TCP,UDP | Aleph One (game) | Unofficial |
| 4224/TCP | Cisco Audio Session Tunneling | Unofficial |
| 4321/TCP | Referral Whois (RWhois) Protocol[31] | Official |
| 4500/UDP | IPSec NAT Traversal (RFC 3947) | Official |
| 4534/UDP | Armagetron Advanced default server port | Unofficial |
| 4569/UDP | Inter-Asterisk eXchange | Unofficial |
| 4610–4640/TCP | QualiSystems TestShell Suite Services | Unofficial |
| 4662/TCP,UDP | OrbitNet Message Service | Official |
| 4662/TCP | often used by eMule | Unofficial |
| 4664/TCP | Google Desktop Search | Unofficial |
| 4664/TCP | Default for Unica's Campaign Listener, though often changed during installation | Unofficial |
| 4672/UDP | eMule—often used | Unofficial |
| 4747/TCP | Apprentice | Unofficial |
| 4750/TCP | BladeLogic Agent | Unofficial |
| 4840/TCP,UDP | OPC UA TCP Protocol for OPC Unified Architecture from OPC Foundation | Official |
| 4843/TCP,UDP | OPC UA TCP Protocol over TLS/SSL for OPC Unified Architecture from OPC Foundation | Official |
| 4847/TCP,UDP | Web Fresh Communication, Quadrion Software & Odorless Entertainment | Official |
| 4993/TCP,UDP | Home FTP Server web Interface Default Port | |
| 4894/TCP,UDP | LysKOM Protocol A | Official |
| 4899/TCP,UDP | Radmin remote administration tool (program sometimes used by a Trojan horse) | Official |
| 5000/TCP | commplex-main | Official |
| 5000/TCP | UPnP—Windows network device interoperability | Unofficial |
| 5000/TCP,UDP | VTun—VPN Software | Unofficial |
| 5001/TCP | commplex-link | Official |
| 5001/TCP,UDP | Iperf (Tool for measuring TCP and UDP bandwidth performance) | Unofficial |
| 5001/TCP | Slingbox and Slingplayer | Unofficial |
| 5003/TCP,UDP | FileMaker | Official |
| 5004/TCP,UDP,DCCP | RTP (Real-time Transport Protocol) media data (RFC 3551, RFC 4571) | Official |
| 5005/TCP,UDP,DCCP | RTP (Real-time Transport Protocol) control protocol (RFC 3551, RFC 4571) | Official |
| 5031/TCP,UDP | AVM CAPI-over-TCP (ISDN over Ethernet tunneling) | Unofficial |
| 5050/TCP | Yahoo! Messenger | Unofficial |
| 5051/TCP | ita-agent Symantec Intruder Alert[32] | Official |
| 5060/TCP,UDP | Session Initiation Protocol (SIP) | Official |
| 5061/TCP | Session Initiation Protocol (SIP) over TLS | Official |
| 5093/UDP | SPSS (Statistical Package for the Social Sciences) License Administrator | Unofficial |
| 5104/TCP | IBM Tivoli Framework NetCOOL/Impact[33] HTTP Service | Unofficial |
| 5106/TCP | A-Talk Common connection | Unofficial |
| 5107/TCP | A-Talk Remote server connection | Unofficial |
| 5110/TCP | ProRat Server | Unofficial |
| 5121/TCP | Neverwinter Nights | Unofficial |
| 5151/TCP | ESRI SDE Instance | Official |
| 5151/UDP | ESRI SDE Remote Start | Official |
| 5154/TCP,UDP | BZFlag | Official |
| 5176/TCP | ConsoleWorks default UI interface | Unofficial |
| 5190/TCP | ICQ and AOL Instant Messenger | Official |
| 5222/TCP | Extensible Messaging and Presence Protocol (XMPP) client connection (RFC 3920) | Official |
| 5223/TCP | Extensible Messaging and Presence Protocol (XMPP) client connection over SSL | Unofficial |
| 5269/TCP | Extensible Messaging and Presence Protocol (XMPP) server connection (RFC 3920) | Official |
| 5298/TCP,UDP | Extensible Messaging and Presence Protocol (XMPP) link-local messaging | Official |
| 5351/TCP,UDP | NAT Port Mapping Protocol—client-requested configuration for inbound connections through network address translators | Official |
| 5353/UDP | Multicast DNS (MDNS) | Official |
| 5355/TCP,UDP | LLMNR—Link-Local Multicast Name Resolution, allows hosts to perform name resolution for hosts on the same local link (only provided by Windows Vista and Server 2008) | Official |
| 5402/TCP,UDP | mftp, Stratacache OmniCast content delivery system MFTP file sharing protocol | Official |
| 5405/TCP,UDP | NetSupport | Official |
| 5421/TCP,UDP | Net Support 2 | Official |
| 5432/TCP,UDP | PostgreSQL database system | Official |
| 5445/UDP | Cisco Unified Video Advantage | Unofficial |
| 5495/TCP | Applix TM1 Admin server | Unofficial |
| 5498/TCP | Hotline tracker server connection | Unofficial |
| 5499/UDP | Hotline tracker server discovery | Unofficial |
| 5500/TCP | VNC remote desktop protocol—for incoming listening viewer, Hotline control connection | Unofficial |
| 5501/TCP | Hotline file transfer connection | Unofficial |
| 5517/TCP | Setiqueue Proxy server client for SETI@Home project | Unofficial |
| 5550/TCP | Hewlett-Packard Data Protector | Unofficial |
| 5555/TCP | Freeciv versions up to 2.0, Hewlett-Packard Data Protector, SAP | Unofficial |
| 5556/TCP,UDP | Freeciv | Official |
| 5631/TCP | pcANYWHEREdata, Symantec pcAnywhere (version 7.52 and later[34])[35] data | Official |
| 5632/UDP | pcANYWHEREstat, Symantec pcAnywhere (version 7.52 and later) status | Official |
| 5666/TCP | NRPE (Nagios) | Unofficial |
| 5667/TCP | NSCA (Nagios) | Unofficial |
| 5723/TCP | Operations Manager | Unofficial |
| 5800/TCP | VNC remote desktop protocol—for use over HTTP | Unofficial |
| 5814/TCP,UDP | Hewlett-Packard Support Automation (HP OpenView Self-Healing Services) | Official |
| 5850/TCP | COMIT SE (PCR) | Unofficial |
| 5852/TCP | Adeona client: communications to OpenDHT | Unofficial |
| 5900/TCP,UDP | Virtual Network Computing (VNC) remote desktop protocol (used by Apple Remote Desktop and others) | Official |
| 5938/TCP,UDP | TeamViewer[36] remote desktop protocol | Unofficial |
| 5984/TCP,UDP | CouchDB database server | Official |
| 5999/TCP | CVSup [37] file update tool | Unknown |
| 6000/TCP | X11—used between an X client and server over the network | Official |
| 6001/UDP | X11—used between an X client and server over the network | Official |
| 6005/TCP | Default for BMC Software CONTROL-M/Server—Socket used for communication between CONTROL-M processes—though often changed during installation | Official |
| 6005/TCP | Default for Camfrog Chat & Cam Client http://www.camfrog.com | Unofficial |
| 6050/TCP | Brightstor Arcserve Backup | Unofficial |
| 6050/TCP | Nortel Software | Unofficial |
| 6051/TCP | Brightstor Arcserve Backup | Unofficial |
| 6072/TCP | iOperator Protocol Signal Port | Unofficial |
| 6086/TCP | PDTP—FTP like file server in a P2P network | Official |
| 6100/TCP | Vizrt System | Unofficial |
| 6101/TCP | Backup Exec Agent Browser | Unofficial |
| 6110/TCP,UDP | softcm, HP Softbench CM | Official |
| 6111/TCP,UDP | spc, HP Softbench Sub-Process Control | Official |
| 6112/TCP,UDP | "dtspcd"—a network daemon that accepts requests from clients to execute commands and launch applications remotely | Official |
| 6112/TCP | Blizzard's Battle.net gaming service, ArenaNet gaming service | Unofficial |
| 6112/TCP | Club Penguin Disney online game for kids | Unofficial |
| 6113/TCP | Club Penguin Disney online game for kids | Unofficial |
| 6129/TCP | DameWare Remote Control | Official |
| 6257/UDP | WinMX (see also 6699) | Unofficial |
| 6346/TCP,UDP | gnutella-svc, Gnutella (FrostWire, Limewire, Shareaza, etc.) | Official |
| 6347/TCP,UDP | gnutella-rtr, Gnutella alternate | Official |
| 6389/TCP | EMC Clariion | Unofficial |
| 6444/TCP,UDP | Sun Grid Engine—Qmaster Service | Official |
| 6445/TCP,UDP | Sun Grid Engine—Execution Service | Official |
| 6502/TCP,UDP | Danware Data NetOp Remote Control | Unofficial |
| 6522/TCP | Gobby (and other libobby-based software) | Unofficial |
| 6523/TCP | Gobby 0.5 (and other libinfinity-based software) | Unofficial |
| 6543/UDP | Paradigm Research & Development Jetnet[38] default | Unofficial |
| 6566/TCP | SANE (Scanner Access Now Easy)—SANE network scanner daemon | Unofficial |
| 6571 | Windows Live FolderShare client | Unofficial |
| 6600/TCP | Music Playing Daemon (MPD) | Unofficial |
| 6619/TCP,UDP | odette-ftps, Odette File Transfer Protocol (OFTP) over TLS/SSL | Official |
| 6646/UDP | McAfee Network Agent | Unofficial |
| 6660–6664/TCP | Internet Relay Chat | Unofficial |
| 6665–6669/TCP | Internet Relay Chat | Official |
| 6679/TCP | IRC SSL (Secure Internet Relay Chat)—often used | Unofficial |
| 6697/TCP | IRC SSL (Secure Internet Relay Chat)—often used | Unofficial |
| 6699/TCP | WinMX (see also 6257) | Unofficial |
| 6771/UDP | Polycom server broadcast | Unofficial |
| 6789/TCP | Datalogger Support Software Campbell Scientific Loggernet Software | Unofficial |
| 6881–6887/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 6888/TCP,UDP | MUSE | Official |
| 6888/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 6889–6890/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 6891–6900/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 6891–6900/TCP,UDP | Windows Live Messenger (File transfer) | Unofficial |
| 6901/TCP,UDP | Windows Live Messenger (Voice) | Unofficial |
| 6901/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 6902–6968/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 6969/TCP,UDP | acmsoda | Official |
| 6969/TCP | BitTorrent tracker | Unofficial |
| 6970–6999/TCP,UDP | BitTorrent part of full range of ports used most often | Unofficial |
| 7000/TCP | Default for Vuze's built in HTTPS Bittorrent Tracker | Unofficial |
| 7001/TCP | Default for BEA WebLogic Server's HTTP server, though often changed during installation | Unofficial |
| 7002/TCP | Default for BEA WebLogic Server's HTTPS server, though often changed during installation | Unofficial |
| 7005/TCP | Default for BMC Software CONTROL-M/Server and CONTROL-M/Agent for Agent-to-Server, though often changed during installation | Official |
| 7006/TCP | Default for BMC Software CONTROL-M/Server and CONTROL-M/Agent for Server-to-Agent, though often changed during installation | Official |
| 7010/TCP | Default for Cisco AON AMC (AON Management Console) [1] | Unofficial |
| 7025/TCP | Zimbra LMTP [mailbox]—local mail delivery | Unofficial |
| 7047/TCP | Zimbra conversion server | Unofficial |
| 7133/TCP | Enemy Territory: Quake Wars | Unofficial |
| 7171/TCP | Tibia | Unofficial |
| 7306/TCP | Zimbra mysql [mailbox] | Unofficial |
| 7307/TCP | Zimbra mysql [logger] | Unofficial |
| 7312/UDP | Sibelius License Server | Unofficial |
| 7400/TCP,UDP | RTPS (Real Time Publish Subscribe) DDS Discovery | Official |
| 7401/TCP,UDP | RTPS (Real Time Publish Subscribe) DDS User-Traffic | Official |
| 7402/TCP,UDP | RTPS (Real Time Publish Subscribe) DDS Meta-Traffic | Official |
| 7670/TCP | BrettspielWelt BSW Boardgame Portal | Unofficial |
| 7676/TCP | Aqumin AlphaVision Remote Command Interface | Unofficial |
| 7777/TCP | iChat server file transfer proxy | Unofficial |
| 7777/TCP | Default used by Windows backdoor program tini.exe | Unofficial |
| 7831/TCP | Default used by Smartlaunch Internet Cafe Administration[39] software | Unofficial |
| 7915/TCP | Default for YSFlight server [2] | Unofficial |
| 8000/TCP,UDP | iRDMI (Intel Remote Desktop Management Interface)[40]—sometimes erroneously used instead of port 8080 | Official |
| 8000–8001/TCP | Commonly used for internet radio streams such as those using SHOUTcast | Unofficial |
| 8002/TCP | Cisco Systems Unified Call Manager Intercluster | Unofficial |
| 8008/TCP | HTTP Alternate | Official |
| 8008/TCP | IBM HTTP Server administration default | Unofficial |
| 8009/TCP | ajp13 – Apache JServ Protocol AJP Connector | Unofficial |
| 8010/TCP | XMPP File transfers | Unofficial |
| 8074/TCP | Gadu-Gadu | Unofficial |
| 8080/TCP | HTTP alternate (http_alt)—commonly used for Web proxy and caching server, or for running a Web server as a non-root user | Official |
| 8080/TCP | Apache Tomcat | Unofficial |
| 8080/UDP | FilePhile Master/Relay | Unofficial |
| 8081/TCP | HTTP alternate, e.g. McAfee ePolicy Orchestrator (ePO) | Unofficial |
| 8086/TCP | HELM Web Host Automation Windows Control Panel | Unofficial |
| 8086/TCP | Kaspersky AV Control Center | Unofficial |
| 8087/TCP | Hosting Accelerator Control Panel | Unofficial |
| 8087/TCP | Parallels Plesk Control Panel | Unofficial |
| 8087/UDP | Kaspersky AV Control Center | Unofficial |
| 8090/TCP | HTTP Alternate (http_alt_alt)—used as an alternative to port 8080 | Unofficial |
| 8116/UDP | Check Point Cluster Control Protocol | Unofficial |
| 8118/TCP | Privoxy—advertisement-filtering Web proxy | Official |
| 8123/TCP | Polipo Web proxy | Official |
| 8192/TCP | Sophos Remote Management System | Unofficial |
| 8193/TCP | Sophos Remote Management System | Unofficial |
| 8194/TCP | Sophos Remote Management System | Unofficial |
| 8200/TCP | GoToMyPC | Unofficial |
| 8222 | VMware Server Management User Interface (insecure Web interface)[41]. See also port 8333 | Unofficial |
| 8243/TCP,UDP | HTTPS listener for Apache Synapse [42] | Official |
| 8280/TCP,UDP | HTTP listener for Apache Synapse [42] | Official |
| 8291/TCP | Winbox—Default on a MikroTik RouterOS for a Windows application used to administer MikroTik RouterOS | Unofficial |
| 8333 | VMware Server Management User Interface (secure Web interface)[41]. See also port 8222 | Unofficial |
| 8400/TCP,UDP | cvp, Commvault Unified Data Management | Official |
| 8443/TCP | SW Soft Plesk Control Panel, Apache Tomcat SSL, Promise WebPAM SSL | Unofficial |
| 8484/TCP,UDP | MapleStory | Unofficial |
| 8500/TCP,IPX | ColdFusion Macromedia/Adobe ColdFusion default and Duke Nukem 3D—default | Unofficial |
| 8501/TCP | [3] DukesterX —default | Unofficial |
| 8691/TCP | Ultra Fractal default server port for distributing calculations over network computers | Unofficial |
| 8701/UDP | SoftPerfect Bandwidth Manager | Unofficial |
| 8702/UDP | SoftPerfect Bandwidth Manager | Unofficial |
| 8767/UDP | TeamSpeak—default | Unofficial |
| 8768/UDP | TeamSpeak—alternate | Unofficial |
| 8880/UDP | cddbp-alt, CD DataBase (CDDB) protocol (CDDBP) alternate | Official |
| 8880/TCP | cddbp-alt, CD DataBase (CDDB) protocol (CDDBP) alternate | Official |
| 8880/TCP | WebSphere Application Server SOAP connector default | Unofficial |
| 8881/TCP | Atlasz Informatics Research Ltd Secure Application Server | Unofficial |
| 8882/TCP | Atlasz Informatics Research Ltd Secure Application Server | Unofficial |
| 8888/TCP,UDP | NewsEDGE server | Official |
| 8888/TCP | Sun Answerbook dwhttpd server (deprecated by docs.sun.com) | Unofficial |
| 8888/TCP | GNUmp3d HTTP music streaming and Web interface | Unofficial |
| 8888/TCP | LoLo Catcher HTTP Web interface (www.optiform.com) | Unofficial |
| 8888/TCP | D2GS Admin Console Telnet administration console for D2GS servers (Diablo 2) | Unofficial |
| 8888/TCP | Earthland Relams 2 Server (AU1_2) | Unofficial |
| 8889/TCP | Earthland Relams 2 Server (AU1_1) | Unofficial |
| 9000/TCP | Buffalo LinkSystem Web access | Unofficial |
| 9000/TCP | DBGp | Unofficial |
| 9000/TCP | SqueezeCenter web server & streaming | Unofficial |
| 9000/UDP | UDPCast | Unofficial |
| 9001 | Microsoft Sharepoint Authoring Environment | Official |
| 9001 | cisco-xremote router configuration | Unofficial |
| 9001 | Tor network default | Unofficial |
| 9001/TCP | DBGp Proxy | Unofficial |
| 9009/TCP,UDP | Pichat Server—Peer to peer chat software | Official |
| 9030/TCP | Tor often used | Unofficial |
| 9043/TCP | WebSphere Application Server Administration Console secure | Unofficial |
| 9050/TCP | Tor | Unofficial |
| 9051/TCP | Tor | Unofficial |
| 9060/TCP | WebSphere Application Server Administration Console | Unofficial |
| 9080/UDP | glrpc, Groove Collaboration software GLRPC | Official |
| 9080/TCP | glrpc, Groove Collaboration software GLRPC | Official |
| 9080/TCP | WebSphere Application Server HTTP Transport (port 1) default | Unofficial |
| 9090/TCP | Openfire Administration Console | Unofficial |
| 9090/TCP | SqueezeCenter control (CLI) | Unofficial |
| 9091/TCP | Openfire Administration Console (SSL Secured) | Unofficial |
| 9100/TCP | PDL Data Stream | Official |
| 9101 | Bacula Director | Official |
| 9102 | Bacula File Daemon | Official |
| 9103 | Bacula Storage Daemon | Official |
| 9105/TCP,UDP | Xadmin Control Daemon | Official |
| 9110/UDP | SSMP Message protocol | Unofficial |
| 9119/TCP,UDP | MXit Instant Messenger | Official |
| 9300/TCP | IBM Cognos 8 SOAP Business Intelligence and Performance Management | Unofficial |
| 9418/TCP,UDP | git, Git pack transfer service | Official |
| 9420/TCP | MooseFS distributed file system – master server to chunk servers | Unofficial |
| 9421/TCP | MooseFS distributed file system – master server to clients | Unofficial |
| 9422/TCP | MooseFS distributed file system – chunk servers to clients | Unofficial |
| 9443/TCP | WSO2 Web Services Application Server HTTPS transport (officially WSO2 Tungsten HTTPS | Official |
| 9443/TCP | WebSphere Application Server HTTP Transport (port 2) default | Unofficial |
| 9535/TCP | mngsuite, LANDesk Management Suite Remote Control | Official |
| 9535/TCP | BBOS001, IBM Websphere Application Server (WAS) High Avail Mgr Com | Unofficial |
| 9535/UDP | mngsuite, LANDesk Management Suite Remote Control | Official |
| 9800/TCP,UDP | WebDAV Source | Official |
| 9800 | WebCT e-learning portal | Unofficial |
| 9875/TCP | Club Penguin Disney online game for kids | Unofficial |
| 9898/TCP,UDP | MonkeyCom | Official |
| 9898/TCP | Tripwire – File Integrity Monitoring Software | Unofficial |
| 9996/TCP,UDP | The Palace "The Palace" Virtual Reality Chat software. – 5 | Official |
| 9999 | Hydranode—edonkey2000 TELNET control | Unofficial |
| 9999/TCP | Lantronix UDS-10/UDS100[43] RS-485 to Ethernet Converter TELNET control | Unofficial |
| 9999 | Urchin Web Analytics | Unofficial |
| 10000 | Webmin—Web-based Linux admin tool | Unofficial |
| 10000 | BackupExec | Unofficial |
| 10000 | Ericsson Account Manager (avim) | Unofficial |
| 10001/TCP | Lantronix UDS-10/UDS100[44] RS-485 to Ethernet Converter default | Unofficial |
| 10008/TCP,UDP | Octopus Multiplexer, primary port for the CROMP protocol, which provides a platform-independent means for communication of objects across a network | Official |
| 10017 | AIX,NeXT, HPUX—rexd daemon control | Unofficial |
| 10024/TCP | Zimbra smtp [mta]—to amavis from postfix | Unofficial |
| 10025/TCP | Ximbra smtp [mta]—back to postfix from amavis | Unofficial |
| 10050/TCP,UDP | Zabbix-Agent | Official |
| 10051/TCP,UDP | Zabbix-Trapper | Official |
| 10113/TCP,UDP | NetIQ Endpoint | Official |
| 10114/TCP,UDP | NetIQ Qcheck | Official |
| 10115/TCP,UDP | NetIQEndpoint | Official |
| 10116/TCP,UDP | NetIQ VoIP Assessor | Official |
| 10200/TCP | FRISK Software International's fpscand virus scanning daemon for Unix platforms [4] | Unofficial |
| 10200–10204/TCP | FRISK Software International's f-protd virus scanning daemon for Unix platforms [5] | Unofficial |
| 10308 | Lock-on: Modern Air Combat | Unofficial |
| 10480 | SWAT 4 Dedicated Server | Unofficial |
| 11211 | memcached | Unofficial |
| 11235 | Savage:Battle for Newerth Server Hosting | Unofficial |
| 11294 | Blood Quest Online Server | Unofficial |
| 11371 | OpenPGP HTTP key server | Official |
| 11576 | IPStor Server management communication | Unofficial |
| 12012/TCP,UDP | Audition Online Dance Battle, Korea Server – Status/Version Check | Unofficial |
| 12013/TCP,UDP | Audition Online Dance Battle, Korea Server | Unofficial |
| 12035/UDP | Linden Lab viewer to sim | Unofficial |
| 12345 | NetBus—remote administration tool (often Trojan horse). Also used by NetBuster. Little Fighter 2 (TCP). | Unofficial |
| 12975/TCP | LogMeIn Hamachi (VPN tunnel software; also port 32976)—used to connect to Mediation Server (bibi.hamachi.cc); will attempt to use SSL (TCP port 443) if both 12975 & 32976 fail to connect | Unofficial |
| 12998–12999/UDP | Takenaka RDI Mirror World on SL | Unofficial |
| 13000–13050/UDP | Linden Lab viewer to sim | Unofficial |
| 13076/TCP | Default for BMC Software CONTROL-M/Enterprise Manager Corba communication, though often changed during installation | Official |
| 13720/TCP,UDP | Symantec NetBackup—bprd (formerly VERITAS) | Official |
| 13721/TCP,UDP | Symantec NetBackup—bpdbm (formerly VERITAS) | Official |
| 13724/TCP,UDP | Symantec Network Utility—vnetd (formerly VERITAS) | Official |
| 13782/TCP,UDP | Symantec NetBackup—bpcd (formerly VERITAS) | Official |
| 13783/TCP,UDP | Symantec VOPIED protocol (formerly VERITAS) | Official |
| 13785/TCP,UDP | Symantec NetBackup Database—nbdb (formerly VERITAS) | Official |
| 13786/TCP,UDP | Symantec nomdb (formerly VERITAS) | Official |
| 14552/TCP | Lasso (programming language) application service | Unofficial |
| 14567/UDP | Battlefield 1942 and mods | Unofficial |
| 15000/TCP | psyBNC | Unofficial |
| 15000/TCP | Wesnoth | Unofficial |
| 15000/TCP | Kaspersky Network Agent | Unofficial |
| 15000/TCP | hydap, Hypack Hydrographic Software Packages Data Acquisition | Official |
| 15000/UDP | hydap, Hypack Hydrographic Software Packages Data Acquisition | Official |
| 15567/UDP | Battlefield Vietnam and mods | Unofficial |
| 15345/TCP,UDP | XPilot Contact | Official |
| 16000/TCP | shroudBNC | Unofficial |
| 16080/TCP | Mac OS X Server Web (HTTP) service with performance cache[45] | Unofficial |
| 16384/UDP | Iron Mountain Digital online backup | Unofficial |
| 16567/UDP | Battlefield 2 and mods | Unofficial |
| 18010/TCP | Super Dancer Online Extreme(SDO-X) – CiB Net Station Malaysia Server | Unofficial |
| 18180/TCP | DART Reporting server | Unofficial |
| 18200/TCP,UDP | Audition Online Dance Battle, AsiaSoft Thailand Server – Status/Version Check | Unofficial |
| 18201/TCP,UDP | Audition Online Dance Battle, AsiaSoft Thailand Server | Unofficial |
| 18206/TCP,UDP | Audition Online Dance Battle, AsiaSoft Thailand Server – FAM Database | Unofficial |
| 18300/TCP,UDP | Audition Online Dance Battle, AsiaSoft SEA Server – Status/Version Check | Unofficial |
| 18301/TCP,UDP | Audition Online Dance Battle, AsiaSoft SEA Server | Unofficial |
| 18306/TCP,UDP | Audition Online Dance Battle, AsiaSoft SEA Server – FAM Database | Unofficial |
| 18400/TCP,UDP | Audition Online Dance Battle, KAIZEN Brazil Server – Status/Version Check | Unofficial |
| 18401/TCP,UDP | Audition Online Dance Battle, KAIZEN Brazil Server | Unofficial |
| 18505/TCP,UDP | Audition Online Dance Battle, Nexon Server – Status/Version Check | Unofficial |
| 18506/TCP,UDP | Audition Online Dance Battle, Nexon Server | Unofficial |
| 18605/TCP,UDP | X-BEAT – Status/Version Check | |
| 18606/TCP,UDP | X-BEAT | Unofficial |
| 19000/TCP,UDP | Audition Online Dance Battle, G10/alaplaya Server – Status/Version Check | Unofficial |
| 19001/TCP,UDP | Audition Online Dance Battle, G10/alaplaya Server | Unofficial |
| 19226/TCP | Panda Software AdminSecure Communication Agent | Unofficial |
| 19638/TCP | Ensim Control Panel | Unofficial |
| 19771/TCP,UDP | Softros LAN Messenger | Unofficial |
| 19813/TCP | 4D database Client Server Communication | Unofficial |
| 19880/TCP | Softros LAN Messenger | Unofficial |
| 20000 | DNP (Distributed Network Protocol), a protocol used in SCADA systems between communicating RTU's and IED's | Official |
| 20000 | Usermin, Web-based user tool | Unofficial |
| 20014/TCP | DART Reporting server | Unofficial |
| 20720/TCP | Symantec i3 Web GUI server | Unofficial |
| 22347/TCP,UDP | WibuKey, WIBU-SYSTEMS AG Software protection system | Official |
| 22350/TCP,UDP | CodeMeter, WIBU-SYSTEMS AG Software protection system | Official |
| 23073 | Soldat Dedicated Server | Unofficial |
| 23399 | Skype Default Protocol | Unofficial |
| 23513 | [6] Duke Nukem Ports | Unofficial |
| 24444 | NetBeans integrated development environment | Unofficial |
| 24465/TCP,UDP | Tonido Directory Server for Tonido which is a Personal Web app and peer-to-peer platform | Official |
| 24554/TCP,UDP | BINKP, Fidonet mail transfers over TCP/IP | Official |
| 24800 | Synergy: keyboard/mouse sharing software | Unofficial |
| 24842 | StepMania: Online: Dance Dance Revolution Simulator | Unofficial |
| 25888/UDP | Xfire (Firewall Report, UDP_IN) IP Address (206.220.40.146) resolves to gameservertracking.xfire.com. Use unknown. | Unofficial |
| 25999/TCP | Xfire | Unofficial |
| 26000/TCP,UDP | id Software's Quake server | Official |
| 26000/TCP | CCP's EVE Online Online gaming MMORPG | Unofficial |
| 26900/TCP | CCP's EVE Online Online gaming MMORPG | Unofficial |
| 26901/TCP | CCP's EVE Online Online gaming MMORPG | Unofficial |
| 27000/UDP | (through 27006) id Software's QuakeWorld master server | Unofficial |
| 27000/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27001/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27002/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27003/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27004/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27005/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27006/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27007/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27008/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27009/TCP | FLEXnet Publisher's License server (from the range of default ports) | Unofficial |
| 27010 | Source engine dedicated server port | Unofficial |
| 27015 | GoldSrc and Source engine dedicated server port | Unofficial |
| 27374 | Sub7 default. Most script kiddies do not change from this. | Unofficial |
| 27500/UDP | (through 27900) id Software's QuakeWorld | Unofficial |
| 27888/UDP | Kaillera server | Unofficial |
| 27900 | (through 27901) Nintendo Wi-Fi Connection | Unofficial |
| 27901/UDP | (through 27910) id Software's Quake II master server | Unofficial |
| 27960/UDP | (through 27969) Activision's Enemy Territory and id Software's Quake III Arena and Quake III and some ioquake3 derived games | Unofficial |
| 28000 | Bitfighter Common/default Bitfighter Server | Unofficial |
| 28001 | Starsiege: Tribes Common/default Tribes v.1 Server | Unofficial |
| 28395/TCP | www.SmartSystemsLLC.com Used by Smart Sale 5.0 | Unofficial |
| 28910 | Nintendo Wi-Fi Connection | Unofficial |
| 28960/UDP | Call of Duty – Call of Duty: United Offensive – Call of Duty 2 – Call of Duty 4: Modern Warfare – Call of Duty: World at War (PC Version) | Unofficial |
| 29900 | (through 29901) Nintendo Wi-Fi Connection | Unofficial |
| 29920 | Nintendo Wi-Fi Connection | Unofficial |
| 30000 | Pokémon Netbattle | Unofficial |
| 30301 | BitTorrent | Unofficial |
| 30564/TCP | Multiplicity: keyboard/mouse/clipboard sharing software | Unofficial |
| 31337/TCP | Back Orifice—remote administration tool (often Trojan horse) | Unofficial |
| 31415 | ThoughtSignal—Server Communication Service (often Informational) | Unofficial |
| 31456/TCP | TetriNET IRC gateway on some servers | Unofficial |
| 31457/TCP | TetriNET | Official |
| 31458/TCP | TetriNET Used for game spectators | Unofficial |
| 32245/TCP | MMTSG-mutualed over MMT (encrypted transmission) | Unofficial |
| 32976/TCP | LogMeIn Hamachi (VPN tunnel software; also port 12975)—used to connect to Mediation Server (bibi.hamachi.cc); will attempt to use SSL (TCP port 443) if both 12975 & 32976 fail to connect | Unofficial |
| 33434/TCP,UDP | traceroute | Official |
| 34443 | Linksys PSUS4 print server | Unofficial |
| 37777/TCP | Digital Video Recorder hardware | Unofficial |
| 36963 | Counter Strike 2D multiplayer (2D clone of popular CounterStrike computer game) | Unofficial |
| 40000/TCP,UDP | SafetyNET p Real-time Industrial Ethernet protocol | Official |
| 43047/TCP | TheòsMessenger second port for service TheòsMessenger | Official |
| 43594–43595/TCP | RuneScape | Unofficial |
| 47808/TCP,UDP | BACnet | Official |
| 49151/TCP,UDP | Reserved[1] | Official |
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