Date First Published: 14th March 2022
Topic: Computer Networking
Subtopic: Network Identifiers
Article Type: Computer Terms & Definitions
Difficulty: MediumDifficulty Level: 5/10
Learn more about what a network port is in this article.
A network port is a unique 16-bit unsigned number that identifies a specific process or type of network service. Ports can range from 1 to 65535 and can be known as communication endpoints. All network connections have a start and end port, which are managed by the operating system of a computer and enable different processes and services to be differentiated. Certain protocols have reserved ports. For example, port 20 and 21 are reserved by FTP and port 110 is reserved by POP3. UDP and TCP can be used as transport protocols, which are used for sending data from one device to another. Port 0 is a reserved port and should not be used in TCP or UDP messages.
All networking devices and processes use a unique port for transferring and receiving data. This means it waits for incoming packets with that port number as their destination port and/or sends outgoing packets with that port number as their source port. Multiple network ports may be used by processes for the purpose of receiving and transferring data.
In addition, firewalls can block specific ports for blocking certain types of traffic, since attackers can send malicious traffic to random ports in the hope that the ports have been left open, meaning that they are able to receive traffic. Because of this fact, firewalls should be set up to put a restriction on network traffic at most available ports as there is no reason for all ports to be left completely open at the same time to receive traffic. A security system that filters incoming traffic and sets the allowed and denied web activity in a network is known as a firewall.
Port numbers are maintained by IANA (Internet Assigned Numbers Authority) and are categorised. IANA maintains a full list of all port numbers. The three categories of port numbers include:
| Port Number | Protocol | Service Name |
|---|---|---|
| 0 | TCP, UDP | Reserved |
| 1 | TCP, UDP | TCP Port Service Multiplexer |
| 5 | TCP, UDP | Remote Job Entry |
| 7 | TCP | ECHO |
| 9 | TCP | Discard - RFC 4340 & 4960 |
| 12 | TCP | Dark Ages of Camelot game |
| 13 | TCP, UDP | Daytime - RFC 867 |
| 17 | TCP, UDP | Quote of the day |
| 18 | TCP, UDP | MSP (Message Send Protocol) |
| 20, 21 | TCP, UDP | FTP |
| 23 | TCP, UDP | Telnet |
| 25 | TCP, UDP | SMTP |
| 26 | TCP | RSFTP |
| 33 | TCP, UDP | DSP (Display Support Protocol) |
| 38 | TCP, UDP | RAC (Remote Access Protocol) |
| 39 | UDP | RLP (Resource Location Protocol) |
| 53 | TCP | DNS (Domain Name System) |
| 80 | TCP | HTTP (Hypertext Transfer Protocol) |
| 81 | TCP | HTTP |
| 92 | TCP, UDP | NPP (Network Printing Protocol) |
| 110 | TCP, UDP | POP3 (Post Office Protocol) |
| 123 | UDP | NTP (Network Time Protocol) |
| 143 | TCP, UDP | IMAP (Internet Message Access Protocol) |
| 161 | TCP, UDP | SNMP (Simple Network Management Protocol) |
| 179 | TCP, UDP | BGP (Border Gateway Protocol) |
| 264 | TCP, UDP | BGMP (Border Gateway Multicast Protocol) |
| 406 | TCP, UDP | IMSP (Interactive Mail Support Protocol) |
| 413 | TCP, UDP | SMSP (Storage Management Services Protocol) |
| 427 | TCP, UDP | SLP (Service Location Protocol) |
| 443 | TCP, UDP | HTTP (Hypertext Transfer Protocol Secure) |
| 444 | TCP, UDP | SNPP (Simple Network Paging Protocol) |
| 465 | TCP, UDP | SMTP protocol over TLS/SSL |
| 520 | TCP | RIP (Routing Information Protocol) |
| 554 | TCP, UDP | RTSP (Real Time Streaming Protocol) |
| 587 | TCP | SMTP (Simple Mail Transfer Protocol) |
| Port Number | Protocol | Service Name |
|---|---|---|
| 1025 | TCP | ShopPro accounting software, IIS, NFS |
| 1026 | TCP, UDP | Calendar Access Control |
| 1027 | TCP | ICQ, IIS |
| 1060 | TCP, UDP | POLESTAR |
| 1080 | TCP, UDP | Socks (Socket Secure) proxy |
| 1352 | TCP, UDP | Lotus Notes |
| 1433 | TCP, UDP | Microsoft SQL Server |
| 1434 | TCP, UDP | Microsoft SQL Server database management system monitor. |
| 1468 | TCP, UDP | CSDM |
| 1477 | TCP, UDP | Microsoft SNA Server |
| 1484 | TCP, UDP | Confluent Licence Manager |
| 1502 | TCP, UDP | Shiva |
| 1688 | TCP | Key Management Service for Windows Activation |
| 1701 | TCP, UDP | Layer 2 Tunneling Protocol (L2TP) |
| 1723 | TCP, UDP | PPTP (Point-to-Point Tunneling Protocol) and macOS Server VPN service |
| 1755 | TCP, UDP | Microsoft NetShow & Media Server |
| 1800 | TCP, UDP | Snom 320 SIP Phone and ANSYS-licence manager |
| 1812 | TCP, UDP | RADIUS |
| 1817 | TCP, UDP | RKB-OSCS |
| 1855 | TCP, UDP | Fiorano RtrSvc |
| 1863 | TCP, UDP | Windows Live Messenger |
| 1900 | TCP, UDP | SSDP and Universal PnP |
| 1935 | TCP, UDP | Macromedia Flash Communications Server, RTMP (Real Time Messaging Protocol) |
| 1985 | TCP, UDP | HSRP (Hot Standby Router Protocol) |
| 1995 | TCP, UDP | Cisco Perf-port |
| 1999 | TCP, UDP | Cisco Identification port |
| 2000 | TCP | Remote Anywhere, ICUII, iSpQ VideoChat, Lineage game |
| 2077 | TCP, UDP | Tivoli Storage Manager and TrelliSoft Agent |
| 2082 | TCP, UDP | IRLP (Internet Radio Linking Project) |
| 2256 | TCP, UDP | PCC MFP |
| 2300 | UDP | Dungeon Siege game |
| 2427 | UDP | Cisco MGCP |
| 2556 | TCP | Bagle backdoor virus (W32.Beagle) |
| 2701 | TCP | KnowShowGo P2P |
| 2900 | UDP | Dungeons & Dragons Online and Lord of the Rings Online games |
| 3000 | TCP | Mirilax licence server, Cloud9 Integrated Development Environment server, Ruby on Rails development default, Meteor development default |
| 3001 | TCP, UDP | Web100 NDT |
| 3001 | TCP, UDP | VidPhone |
| 3039 | TCP, UDP | Cogitate, Inc |
| 3050 | TCP, UDP | Borland Interbase database (gds_db) |
| 3052 | TCP, UDP | APC 3052, Powerchute |
| 3061 | TCP, UDP | cautcpd |
| 3074 | TCP, UDP | XBOX 360 |
| 3090 | UDP | Rainbow Six: Vegas game |
| 3090 | TCP, UDP | Senforce Sessions Services (stss), Rappore Session Services (rtss. |
| 3101 | TCP | BES Blackberry Enterprise Server |
| 3101 | UDP | Rainbow Six: Vegas game |
| 3101 | TCP, UDP | HP PolicyXpert PIB Server |
| 3128 | TCP | Active API server port, proxy server port, known Trojan and backdoor port |
| 3260 | TCP | iSCSI target |
| 3268 | TCP, UDP | Microsoft Global Catalog |
| 3306 | TCP | Caesar IV game |
| 3306 | TCP, UDP | MySQL database server |
| 3350 | UDP | Settlers 3 game |
| 3350 | TCP, UDP | FINDVIATV |
| 3268 | TCP, UDP | Microsoft Global Catalog |
| 3269 | TCP, UDP | Microsoft Global Catalog on SSL |
| 3389 | TCP, UDP | Remote Desktop and Microsoft Terminal Services |
| 3525 | TCP, UDP | EIS Server port |
| 3783 | TCP | Gamespy |
| 3784 | TCP, UDP | Ventrilo and BFD Control Protocol |
| 4000 | TCP | Battle.net, Diablo and Diablo II |
| 4000 | UDP | ICQ |
| 4000 | TCP, UDP | Command & Conquer: Tiberian Sun and Dune 2000. |
| 4006 | TCP, UDP | pxc-spvr |
| 4062 | TCP, UDP | Ice Location Service on SSL |
| 4373 | TCP, UDP | Remote Authenticated Command Service |
| 4444 | TCP, UDP | Oracle WebCenter Content |
| 4444 | TCP, UDP | Xvfb X server virtual frame buffer service |
| 4567 | TCP | Verizon Actiontec Routers |
| 5000 | TCP | DINA DVR Server and Dwyco Video Conferencing |
| 5000 | TCP, UDP | Universal Plug-and-Play (UPnP), AIM Video IM, and Yahoo Messenger Voice Chat |
| 5060 | TCP, UDP | Session Initiation Protocol (SIP) |
| 5190 | TCP | AOL Instant Messenger and ICQ |
| 5190 | UDP | Windows Live Messenger |
| 5191 | UDP | Neverwinter Nights 2 game |
| 5191 | TCP, UDP | AOL 1, AOL Instant Messenger, and ICQ |
| 5192 | UDP | Neverwinter Nights 2 game |
| 5192 | TCP, UDP | AOL 2, AOL Instant Messenger, and ICQ |
| 5193 | UDP | Neverwinter Nights 2 game |
| 5193 | TCP, UDP | AOL 3, AOL Instant Messenger, and ICQ |
| 5200 | TCP | Echolink |
| 5200 | UDP | Neverwinter Nights 2 game |
| 5200 | TCP, UDP | TARGUS GetData |
| 5252 | UDP | Neverwinter Nights 2 game |
| 5252 | TCP, UDP | Movaz SSC |
| 5314 | TCP, UDP | opalis-rbt-ipc |
| 5353 | UDP | iChat, MultiCast DNS, and macOS X Bonjour/Zeroconf |
| 5424 | TCP, UDP | Beyond Remote, W32.MyDoom worm |
| 5445 | UDP | Cisco Unified Video Advantage |
| 5445 | TCP, UDP | Server Message Block over Remote Direct Memory Access |
| 5500 | TCP | HotLine, P2P file sharing, MOHAA (Medal of Honor: Allied Assault), MatchWatch & Reverend, VNC (Virtual Network Computing) |
| 5500 | UDP | SecurID |
| 5631 | TCP, UDP | PCAnywhere |
| 5632 | TCP | MOHAA (Medal of Honor: Allied Assault) Reverend |
| 5632 | UDP | PCAnywhere |
| 5678 | TCP | MOHAA (Medal of Honor: Allied Assault) Reverend |
| 5678 | UDP | iChat. |
| 5678 | TCP, UDP | Linksys Cable/DSL, Routers, Remote Administration |
| 5687 | TCP | MOHAA (Medal of Honor: Allied Assault) Reverend |
| 5800 | TCP | VNC |
| 5801 | TCP | VNC |
| 5900 | TCP | VNC |
| 5901 | TCP | VNC |
| 6000 | UDP | Playstation 3, Everquest, Madden NFL 2005, Medal of Honor: Rising Sun. |
| 6000 | TCP, UDP | X Window |
| 6062 | TCP, UDP | X Windows System |
| 6073 | UDP | Dungeon Siege game |
| 6084 | TCP | Peer to Peer Infrastructure Protocol |
| 6086 | TCP, UDP | PDTP P2P |
| 6112 | TCP, UDP | Battle.net |
| 6113 | TCP, UDP | Battle.net |
| 6114 | TCP, UDP | Battle.net |
| 6115 | TCP, UDP | Battle.net. |
| 6116 | TCP, UDP | Battle.net |
| 6117 | TCP, UDP | Battle.net |
| 6118 | TCP, UDP | Battle.net |
| 6119 | TCP, UDP | Battle.net |
| 6421 | TCP, UDP | NIM_WAN |
| 6500 | TCP | Gamespy Arcade, Net2Phone registration |
| 6500 | TCP, UDP | Black & White, Civilization III, Civilization IV, Star Wars: Battlefront, Star Wars: Empire at War |
| 6542 | TCP | irccd.exe service |
| 6667 | TCP | Gamespy, IRC, Black & White, Civilization III, Civilization IV, Command & Conquer series, Warhammer 4000: Dawn of War, Worms 4: Mayhem |
| 6667 | UDP | Neverwinter Nights, Rainbow Six 3, Raven Shield. |
| 6667 | TCP, UDP | MSN Game Zone, Star Wars, Empire at War game |
| 6801 | TCP, UDP | Net2Phone, ACNet Control System Protocol |
| 7000 | TCP | Command Conquer series, Dune 2000, Emperor: Battle for Dune, Everquest, Everquest 2 |
| 7000 | UDP | Real Audio, Quicktime 4 server, and Playstation 3 |
| 7070 | TCP | Real Audio |
| 7070 | UDP | Games: City of Heroes, City of Villains |
| 7075 | UDP | Real Audio, City of Heroes, City of Villains |
| 7900 | TCP, UDP | Multicast Event |
| 8000 | TCP | Winamp Audio Streaming, X-Lite, Icecast, and internet radio streams using Shoutcast |
| 8000 | UDP | Aliens vs Predator game |
| 8000 | TCP, UDP | iRDMI |
| 8008 | TCP, UDP | HTTP alternative |
| 8080 | TCP | EvoCam, Pirate Radio, WebcamXP, Unreal Tournament game |
| 8080 | TCP, UDP | HTTP alternative |
| 8081 | TCP | HTTP alternative and BlackICE ICEcap user console |
| 8081 | TCP, UDP | Dreambox 8000 |
| 8084 | TCP | IBM Lotus Sametime server and Apache Tomcat server |
| 8090 | TCP | HTTP alternative and WebcamXP |
| 8092 | TCP,UDP | iTunes Radio Stream, EMC2 (Legato) Networker or Sun Solcitice Backup, QuickTime streaming |
| 8118 | TCP | Privoxy |
| 8443 | TCP, UDP | PCsync HTTPS, PCSync SSL, SW Soft Plesk Control Panel, Apache Tomcast SSL, and iCal service |
| 9000 | UDP | Asheron's Call game |
| 9010 | UDP | Asheron's Call game |
| 9011 | UDP | Asheron's Call game |
| 9012 | UDP | Asheron's Call game |
| 9013 | UDP | Asheron's Call game |
| 9090 | TCP | Zeus admin server |
| 9090 | TCP, UDP | WebSM |
| 9092 | TCP, UDP | Xml-Ipc Server Reg, Championship Manager 4 |
| 9100 | TCP | Used to send raw data to a printer |
| 9339 | TCP | Clash of Clans, a mobile freemium strategy video game |
| 9200 | TCP | Elasticsearch-default Elasticsearch port |
| 10000 | TCP, UDP | Network Data Management Protocol (NDMP) |
| 12345 | TCP | Used by Tend Micro antivirus program. In addition, Port 12345 is also commonly used by different Trojans such as Netbus |
| 12468 | TCP | VXtreme and WebTheater |
| 17770 | UDP | Battlezone 2 game |
| 17771 | TCP,UDP | Battlezone 2 game |
| 17772 | UDP | Battlezone 2 game |
| 26000 | TCP, UDP | Quake, Elite Force, Empire Earth 2, and QuakeWorld master server |
| 27015 | TCP | Half-Life |
| 27900 | TCP | Gamespy |
| 28900 | TCP | Gamespy |
| 29900 | TCP | Gamespy |
| 29901 | TCP | Gamespy |
| 31337 | TCP | Back orifice |
| 33334 | UDP | Empire Earth game. |
| 33335 | TCP | Empire Earth game. |
| 43188 | TCP, UDP | REACHOUT |
| 47624 | TCP | Age of Empires, Baldur's Gate, Close Combat |
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