The following table lists the most common communication ports used by services, daemons, and programs, including those in Red Hat Enterprise Linux. This list can also be found in the /etc/services file. For the official list of "well-known registered dynamic ports" established by the Internet Assigned Numbers Authority (IANA), please refer to the following URL:
http://www.iana.org/assignments/port-numbers
"Layer" refers to whether the service or protocol uses TCP or UDP at the transport layer. If not listed, the service or protocol uses both.
| Port Number / Layer | Name | Comment |
|---|---|---|
| 1 | tcpmux | TCP port service multiplexing |
| 5 | rje | Remote Job Entry |
| 7 | echo | Echo service |
| 9 | discard | Null service for connection testing |
| 11 | systat | System status for listing connected ports |
| 13 | daytime | Sends the date and time to the requesting host |
| 17 | qotd | Sends a quote of the day to connected hosts |
| 18 | msp | Message Send Protocol |
| 19 | chargen | Character generator service; sends an endless stream of characters |
| 20 | ftp-data | FTP data port |
| 21 | ftp | File Transfer Protocol (FTP) port; sometimes used by File Service Protocol (FSP) |
| 22 | ssh | Secure Shell (SSH) service |
| 23 | telnet | Telnet service |
| 25 | smtp | Simple Mail Transfer Protocol (SMTP) |
| 37 | time | Time protocol |
| 39 | rlp | Resource Location Protocol |
| 42 | nameserver | Internet name service |
| 43 | nicname | WHOIS directory service |
| 49 | tacacs | Terminal Access Controller Access-Control System for TCP/IP-based authentication and access |
| 50 | re-mail-ck | Remote Mail Check Protocol |
| 53 | domain | Domain Name Service (such as BIND) |
| 63 | whois++ | WHOIS++, an extended WHOIS service |
| 67 | bootps | Bootstrap Protocol (BOOTP) service; also used by Dynamic Host Configuration Protocol (DHCP) service |
| 68 | bootpc | Bootstrap (BOOTP) client; also used by Dynamic Host Configuration Protocol (DHCP) client |
| 69 | tftp | Trivial File Transfer Protocol (TFTP) |
| 7 | gopher | Gopher Internet document search and retrieval |
| 71 | netrjs-1 | Remote Job Service |
| 72 | netrjs-2 | Remote Job Service |
| 73 | netrjs-3 | Remote Job Service |
| 73 | netrjs-4 | Remote Job Service |
| 79 | finger | Finger service for user contact information |
| 80 | http | Hypertext Transfer Protocol (HTTP) for World Wide Web (WWW) service |
| 88 | kerberos | Kerberos Network Authentication System |
| 95 | supdup | Telnet protocol extension |
| 101 | hostname | Hostname service on SRI-NIC machine |
| 102 | iso-tsap | ISO Development Environment (ISODE) network application |
| 105 | csnet-ns | Mailbox Name Server; also used by CSO Name Server |
| 107 | rtelnet | Remote Telnet |
| 109 | pop2 | Post Office Protocol version 2 |
| 110 | pop3 | Post Office Protocol version 3 |
| 111 | sunrpc | Remote Procedure Call (RPC) protocol for remote command execution, used by Network File System (NFS) |
| 113 | auth | Authentication and Identification Protocol |
| 115 | sftp | Secure File Transfer Protocol (SFTP) service |
| 117 | uucp-path | Unix to Unix Copy Protocol (UUCP) Path Service |
| 119 | nntp | Network News Transfer Protocol (NNTP) for USENET discussion systems |
| 123 | ntp | Network Time Protocol (NTP) |
| 137 | netbios-ns | NETBIOS Name Service used by Samba in Red Hat Enterprise Linux |
| 138 | netbios-dgm | NETBIOS Datagram Service used by Samba in Red Hat Enterprise Linux |
| 139 | netbios-ssn | NETBIOS Session Service used by Samba in Red Hat Enterprise Linux |
| 143 | imap | Internet Message Access Protocol (IMAP) |
| 161 | snmp | Simple Network Management Protocol (SNMP) |
| 162 | snmptrap | SNMP Traps |
| 163 | cmip-man | Common Management Information Protocol (CMIP) |
| 164 | cmip-agent | Common Management Information Protocol (CMIP) |
| 174 | mailq | MAILQ |
| 177 | xdmcp | X Display Manager Control Protocol |
| 178 | nextstep | NeXTStep window server |
| 179 | bgp | Border Gateway Protocol |
| 191 | prospero | Prospero service by Clifford Neuman |
| 194 | irc | Internet Relay Chat (IRC) |
| 199 | smux | SNMP UNIX Multiplexing |
| 201 | at-rtmp | AppleTalk Routing |
| 202 | at-nbp | AppleTalk Name Binding |
| 204 | at-echo | AppleTalk Echo Service |
| 206 | at-zis | AppleTalk Zone Information |
| 209 | qmtp | Quick Mail Transfer Protocol (QMTP) |
| 210 | z39.50 | NISO Z39.50 Database |
| 213 | ipx | Internetwork Packet Exchange Protocol (IPX), a datagram protocol commonly used in Novell Netware environment |
| 220 | imap3 | Internet Message Access Protocol version 3 |
| 245 | link | LINK |
| 347 | fatserv | Fatmen Server |
| 363 | rsvp_tunnel | RSVP Tunnel |
| 369 | rpc2portmap | Coda File System Portmapper |
| 370 | codaauth2 | Coda File System Authentication Service |
| 372 | ulistproc | UNIX Listserv |
| 389 | ldap | Lightweight Directory Access Protocol (LDAP) |
| 427 | svrloc | Service Location Protocol (SLP) |
| 434 | mobileip-agent | Mobile Internet Protocol (IP) Agent |
| 435 | mobilip-mn | Mobile Internet Protocol (IP) Manager |
| 443 | https | Secure HyperText Transfer Protocol (HTTP) |
| 444 | snpp | Simple Network Paging Protocol |
| 445 | microsoft-ds | Server Message Block (SMB) over TCP/IP |
| 464 | kpasswd | Kerberos Password and Key Change Service |
| 468 | photuris | Photuris Session Key Management Protocol |
| 487 | saft | Simple Asymmetric File Transfer (SAFT) Protocol |
| 488 | gss-http | Generic Security Service (GSS) for HTTP |
| 496 | pim-rp-disc | Protocol Independent Multicast (PIM) Service's Rendezvous Point Discovery (RP-DISC) |
| 500 | isakmp | Internet Security Association and Key Management Protocol (ISAKMP) |
| 535 | iiop | Internet Inter-ORB Protocol (IIOP) |
| 538 | gdomap | GNUstep Distributed Object Mapper (GDOMAP) |
| 546 | dhcpv6-client | Dynamic Host Configuration Protocol (DHCP) version 6 client |
| 547 | dhcpv6-server | Dynamic Host Configuration Protocol (DHCP) version 6 server |
| 554 | rtsp | Real Time Streaming Protocol (RTSP) |
| 563 | nntps | Network News Transfer Protocol over Secure Sockets Layer (NNTPS) |
| 565 | whoami | whoami |
| 587 | submission | Mail Submission Agent (MSA) |
| 610 | npmp-local | Network Peripheral Management Protocol (NPMP) local / Distributed Queue System (DQS) |
| 611 | npmp-gui | Network Peripheral Management Protocol (NPMP) GUI / Distributed Queue System (DQS) |
| 612 | hmmp-ind | HMMP Indication / DQS |
| 631 | ipp | Internet Printing Protocol (IPP) |
| 636 | ldaps | Lightweight Directory Access Protocol over Secure Sockets Layer (LDAPS) |
| 674 | acap | Application Configuration Access Protocol (ACAP) |
| 694 | ha-cluster | Heartbeat service for clusters with high availability |
| 749 | kerberos-adm | Kerberos version 5 (v5) "kadmin" database administration |
| 750 | kerberos-iv | Kerberos version 4 (v4) services |
| 765 | webster | Online Dictionary |
| 767 | phonebook | Online Phonebook |
| 873 | rsync | rsync File Transfer Service |
| 992 | telnets | Telnet over Secure Sockets Layer (TelnetS) |
| 993 | imaps | Internet Message Access Protocol over Secure Sockets Layer (IMAPS) |
| 994 | ircs | Internet Relay Chat over Secure Sockets Layer (IRCS) |
| 995 | pop3s | Post Office Protocol version 3 over Secure Sockets Layer (POPS3) |
| Port Number / Layer | Name | Comments |
|---|---|---|
| 512/tcp | exec | Used for authentication of processes for remote execution |
| 512/udp | biff [comsat] | Asynchronous mail client (biff) and service (comsat) |
| 513/tcp | login | Remote login (rlogin) |
| 513/udp | who [whod] | List of logged-in users |
| 514/tcp | shell [cmd] | Remote shell (rshell) and remote copy (rcp) without logging in |
| 514/udp | syslog | UNIX System Logging Service |
| 515 | printer [spooler] | Printer (lpr) Spooler |
| 517/udp | talk | Remote conversation service and client |
| 518/udp | ntalk | Network Talk (ntalk), remote conversation service and client |
| 519 | utime [unixtime] | UNIX Time Protocol (utime) |
| 520/tcp | efs | Extended File Name Server (EFS) |
| 520/udp | router [route, routed] | Routing Information Protocol (RIP) |
| 521 | ripng | Routing Information Protocol for Internet Protocol version 6 (IPv6) |
| 525 | timed [timeserver] | Time Daemon (timed) |
| 526/tcp | tempo [newdate] | Tempo |
| 530/tcp | courier [rpc] | Courier Remote Procedure Call (RPC) protocol |
| 531/tcp | conference [chat] | Internet Relay Chat |
| 532 | netnews | Netnews |
| 533/udp | netwall | Netwall for emergency broadcasts |
| 540/tcp | uucp [uucpd] | Unix to Unix Copy Protocol (UUCP) service |
| 543/tcp | klogin | Kerberos version 5 (v5) remote login |
| 544/tcp | kshell | Kerberos version 5 (v5) remote shell |
| 548 | afpovertcp | Apple Filing Protocol (AFP) over Transmission Control Protocol (TCP) |
| 556 | remotefs [rfs_server, rfs] | Brunhoff's Remote File System (RFS) |
| Port Number / Layer | Name | Comment |
|---|---|---|
| 1080 | socks | SOCKS network application proxy service |
| 1236 | bvcontrol [rmtcfg] | Garcilis Packeten Remote Configuration Server |
| 1300 | h323hostcallsc | H.323 Teleconferencing Host Call Security |
| 1433 | ms-sql-s | Microsoft SQL Server |
| 1434 | ms-sql-m | Microsoft SQL ** |
| 1494 | ica | Citrix ICA client |
| 1512 | wins | Microsoft Windows Internet Name Server |
| 1524 | ingreslock | Ingres Database Management System (DBMS) Lock Service |
| 1525 | prospero-np | Unprivileged Prospero |
| 1645 | datametrics [old-radius] | Datametrics / Former radius project |
| 1646 | sa-msg-port [oldradacct] | sa-msg-port / Former radacct project |
| 1649 | kermit | Kermit File Transfer and Management Service |
| 1701 | l2tp [l2f] | Layer 2 Tunneling Protocol (L2TP) / Layer 2 Forwarding (L2F) |
| 1718 | h323gatedisc | H.323 Telecommunication Gatekeeper Discovery Mechanism |
| 1719 | h323gatestat | H.323 Telecommunication Gatekeeper Status |
| 172 | h323hostcall | H.323 Telecommunication Host Call Setup |
| 1758 | tftp-mcast | Trivial File Transfer Protocol (TFTP) Multicast |
| 1759 | mtftp | Multicast Trivial File Transfer Protocol (MTFTP) |
| 1789 | hello | Hello Router Communication Port |
| 1812 | radius | Radius Dial-up Authentication and Accounting Services |
| 1813 | radius-acct | Radius Accounting |
| 1911 | mtp | Starlight Network Multimedia Transfer Protocol (MTP) |
| 1985 | hsrp | Cisco Hot Standby Router Protocol |
| 1986 | licensedaemon | Cisco License Management Daemon |
| 1997 | gdp-port | Cisco ** Discovery Protocol (GDP) |
| 2049 | nfs [nfsd] | Network File System (NFS) |
| 2102 | zephyr-srv | Zephyr Notification Transmission and Sending Server |
| 2103 | zephyr-clt | Zephyr serv-hm Connection |
| 2104 | zephyr-hm | Zephyr Host Manager |
| 2401 | cvspserver | Concurrent Versions System (CVS) Client/Server Operation |
| 243/tcp | venus | Venus Cache Manager for Coda File System (codacon port) |
| 243/udp | venus | Venus Cache Manager for Coda File System (callback/wbc interface interface) |
| 2431/tcp | venus-se | Venus Side Effect of Transmission Control Protocol (TCP) |
| 2431/udp | venus-se | Venus Side Effect of User Datagram Protocol (UDP) |
| 2432/udp | codasrv | Coda File System Server Port |
| 2433/tcp | codasrv-se | Coda File System TCP Side Effect |
| 2433/udp | codasrv-se | Coda File System UDP SFTP Side Effect |
| 2600 | hpstgmgr [zebrasrv] | HPSTGMGR; Zebra Routing |
| 2601 | discp-client [zebra] | DISCP Client; Zebra Integrated Shell |
| 2602 | discp-server [ripd] | DISCP Server; Routing Information Protocol Daemon (ripd) |
| 2603 | servicemeter [ripngd] | Service Meter; RIP Daemon for IPv6 |
| 2604 | nsc-ccs [ospfd] | NSC CCS; Open Shortest Path First Daemon (ospfd) |
| 2605 | nsc-posa | NSC POSA; Border Gateway Protocol Daemon (bgpd) |
| 2606 | netmon [ospf6d] | Dell Netmon; OSPF Daemon for IPv6 (ospf6d) |
| 2809 | corbaloc | Common Object Request Broker Architecture (CORBA) Naming Service ** |
| 3130 | icpv2 | Internet Cache Protocol version 2 (v2); Used by Squid Proxy Cache Server |
| 3306 | mysql | MySQL Database Service |
| 3346 | trnsprntproxy | Transparent Proxy |
| 4011 | pxe | Preboot Execution Environment (PXE) Service |
| 4321 | rwhois | Remote Whois (rwhois) Service |
| 4444 | krb524 | Kerberos version 5 (v5) to version 4 (v4) Ticket Converter |
| 5002 | rfe | Radio Frequency Ethernet (RFE) Audio Broadcast System |
| 5308 | cfengine | Configuration Engine (Cfengine) |
| 5999 | cvsup [CVSup] | CVSup File Transfer and Update Utility |
| 6000 | x11 [X] | X Window System Service |
| 7000 | afs3-fileserver | Andrew File System (AFS) File Server |
| 7001 | afs3-callback | AFS Port for Callback to Cache Managers |
| 7002 | afs3-prserver | AFS User and Group Database |
| 7003 | afs3-vlserver | AFS Volume Location Database |
| 7004 | afs3-kaserver | AFS Kerberos Authentication Service |
| 7005 | afs3-volser | AFS Volume Management Server |
| 7006 | afs3-errors | AFS Error Interpretation Service |
| 7007 | afs3-bos | AFS Basic Overseer Process |
| 7008 | afs3-update | AFS Server-to-Server Updater |
| 7009 | afs3-rmtsys | AFS Remote Cache Manager Service |
| 9876 | sd | Session Director |
| 10080 | amanda | Advanced Maryland Automated Network Disk Archiver (Amanda) Backup Service |
| 11371 | pgpkeyserver | Pretty Good Privacy (PGP) / GNU Privacy Guard (GPG) Public Key Server |
| 11720 | h323callsigalt | H.323 Call Signal Alternate |
| 13720 | bprd | Veritas NetBackup Request Daemon (bprd) |
| 13721 | bpdbm | Veritas NetBackup Database Manager (bpdbm) |
| 13722 | bpjava-msvc | Veritas NetBackup Java / Microsoft Visual C++ (MSVC) Protocol |
| 13724 | vnetd | Veritas Network Tool |
| 13782 | bpcd | Vertias NetBackup |
| 13783 | vopied | Veritas VOPIED Protocol |
| 22273 | wnn6 [wnn4] | Kana/Character Conversion System |
| 26000 | quake | Quake (and related) Multiplayer Game Server |
| 26208 | wnn6-ds | |
| 33434 | traceroute | Traceroute Network Trace Tool |
| Port Number / Layer | Name | Comment |
|---|---|---|
| 1/ddp | rtmp | Routing Table Management Protocol |
| 2/ddp | nbp | Name Binding Protocol |
| 4/ddp | echo | AppleTalk Echo Protocol |
| 6/ddp | zip | Zone Information Protocol |
| Port Number / Layer | Name | Comment |
|---|---|---|
| 751 | kerberos_master | Kerberos Authentication |
| 752 | passwd_server | Kerberos Password (kpasswd) Server |
| 754 | krb5_prop | Kerberos v5 Slave Propagation |
| 760 | krbupdate [kreg] | Kerberos Registration |
| 1109 | kpop | Kerberos Post Office Protocol (KPOP) |
| 2053 | knetd | Kerberos Multiplexer |
| 2105 | eklogin | Kerberos v5 Encrypted Remote Login (rlogin) |
| Port Number / Layer | Name | Comment |
|---|---|---|
| 15/tcp | netstat | Network Status (netstat) |
| 98/tcp | linuxconf | Linuxconf Linux Management Tool |
| 106 | poppassd | Post Office Protocol Password Change Daemon (POPPASSD) |
| 465/tcp | smtps | Simple Mail Transfer Protocol over Secure Sockets Layer (SMTPS) |
| 616/tcp | gii | Interactive Interface using ** (Routing Daemon) |
| 808 | omirr [omirrd] | Online Mirror (Omirr) File Mirroring Service |
| 871/tcp | supfileserv | Software Update Protocol (SUP) Server |
| 901/tcp | swat | Samba Web Administration Tool (SWAT) |
| 953 | rndc | Berkeley Internet Name Domain Version 9 (BIND 9) Remote Name Daemon Configuration Tool |
| 1127 | sufiledbg | Software Update Protocol (SUP) Debugging |
| 1178/tcp | skkserv | Simple Kana to Kanji (SKK) Japanese Input Server |
| 1313/tcp | xtel | French Minitel Text Information System |
| 1529/tcp | support [prmsd, gnatsd] | GNATS Bug-Tracking System |
| 2003/tcp | cfinger | GNU Finger Service |
| 2150 | ninstall | Network Installation Service |
| 2988 | afbackup | afbackup Client-Server Backup System |
| 3128/tcp | squid | Squid Web Proxy Cache |
| 3455 | prsvp | Resource Reservation Protocol (RSVP) Port |
| 5432 | postgres | PostgreSQL Database |
| 4557/tcp | fax | FAX Transmission Service (Old Service) |
| 4559/tcp | hylafax | HylaFAX Client-Server Protocol (New Service) |
| 5232 | sgi-dgl | SGI Distributed Graphics Library |
| 5354 | noclog | NOCOL Network Operations Center Log Daemon (noclogd) |
| 5355 | hostmon | NOCOL Network Operations Center Host Monitoring |
| 568/tcp | canna | Canna Japanese Character Input Interface |
| 6010/tcp | x11-ssh-offset | Secure Shell (SSH) X11 Forwarding Offset |
| 6667 | ircd | Internet Relay Chat Daemon (ircd) |
| 7100/tcp | xfs | X Font Server (XFS) |
| 7666/tcp | tircproxy | Tircproxy IRC Proxy Service |
| 8008 | http-alt | Alternative for Hypertext Transfer Protocol (HTTP) |
| 808 | webcache | World Wide Web (WWW) Cache Service |
| 8081 | tproxy | Transparent Proxy |
| 9100/tcp | jetdirect [laserjet, hplj] | Hewlett-Packard (HP) JetDirect Network Printing Service |
| 9359 | mandelspawn [mandelbrot] | Parallel Mandelbrot Set Generator for X Window System |
| 10081 | kamanda | Amanda Backup Service with Kerberos |
| 10082/tcp | amandaidx | Amanda Backup Service |
| 10083/tcp | amidxtape | Amanda Backup Service |
| 20011 | isdnlog | Integrated Services Digital Network (ISDN) Logging System |
| 20012 | vboxd | ISDN Speaker Daemon (vboxd) |
| 22305/tcp | wnn4_Kr | kWnn Korean Input System |
| 22289/tcp | wnn4_Cn | cWnn Chinese Input System |
| 22321/tcp | wnn4_Tw | tWnn Chinese Input System (**) |
| 24554 | binkp | Binkley TCP/IP FidoNet Mail Program Daemon |
| 27374 | asp | Address Search Protocol |
| 60177 | tfido | Ifmail FidoNet Compatible Mail Service |
| 60179 | fido | FidoNet Email and News Network |