TCP/UDP Common Port Reference.
TCP/UDP are two communication protocols used for data transmission across networks. Each protocol uses different sets of port numbers to differentiate between different types of data flows.Some commonly used TCP ports include:- Port 80: used for web browsing- Port 25: used for email transmission- Port 443: used for secure web browsing- Port 21: used for FTP (file transfer protocol)Some commonly used UDP ports include:- Port 53: used for DNS (domain name system)- Port 123: used for NTP (network time protocol)- Port 161: used for SNMP (simple network management protocol)- Port 514: used for syslog (system logging protocol)Understanding these commonly used TCP/UDP port numbers can help network administrators troubleshoot and optimize network traffic.
The following table lists the most common communication ports used by services, daemons, and programs included with Red Hat Enterprise Linux. This list can also be found in the /etc/services file. To view the official list of "Well-Known Registered Dynamic Ports" as compiled by the Internet Assigned Numbers Authority (IANA), 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.
Quick Index:
Famous PortsUNIX-specific PortsRegistered PortsDatagram Transfer Protocol PortsKerberos (Project Athena/MIT) PortsUnregistered Ports
Famous Ports
| 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 | Send date and time to requesting host | ||
| 17 | qotd | Sends a daily quote to the connected host | ||
| 18 | msp | Message Sending Protocol | ||
| 19 | chargen | Character generation service; sends an unending 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 td> | ||
| 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 Checking 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 the Dynamic Host Configuration Protocol (DHCP) service | ||
| 68 | bootpc | Bootstrap (BOOTP) client; also used by the Dynamic Host Configuration Protocol (DHCP) client | ||
| 69 | tftp | Trivial File Transfer Protocol (TFTP) | ||
| 70 | 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) services | ||
| 88 | kerberos | Kerberos network authentication system | ||
| 95 | supdup | Telnet protocol extension | ||
| 101 | hostname | Hostname service on SRI-NIC machines 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 the 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 the USENET discussion system | ||
| 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) | ||
| 161 164 | 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 Network Protocol | ||
| 191 | prospero | Cliffod Neuman's Prospero service | ||
| 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 block information | ||
| 209 | qmtp | d>Quick Mail Transfer Protocol (QMTP) | ||
| 210 | z39.50 | NISO Z39.50 database | ||
| 213 | ipx | Internet Packet Exchange Protocol (IPX), a datagram protocol commonly used in Novell Netware environments | ||
| 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 Port Mapper | ||
| 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 | Portable Internet Protocol (IP) Agent |
| 435 | mobilip-mn | Portable Internet Protocol (IP) Manager | ||
| 443 | https | Secure Hypertext Transfer Protocol (HTTP) | ||
| 444 | snpp | Small Network Paging Protocol | ||
| 445 | microsoft-ds | Server Message Block (SMB) over TCP/IP | ||
| 464 | kpasswd | Kerberos Password and Key Rotation Service | ||
| 468 | photuris | Photuris Session Key Management Protocol | ||
| 487 | saft | Simple Asymmetric File Transfer (SAFT) Protocol | ||
| 488 | gss-http | Generic Security Services (GSS) for HTTP | ||
| 496 | pim-rp-disc | Rendezvous Point Discovery (RP-DISC) for Protocol Independent Multicast (PIM) Service | ||
| 500 | isakmp 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 Message Submission Agent (MSA) | ||
| 610 | npmp-local | Network Peripheral Management Protocol (NPMP) Local / Distributed Queuing System (DQS) | ||
| 611 | npmp-gui | Network Peripheral Management Protocol (NPMP) GUI / Distributed Queuing 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 | kadmin database administration for Kerberos version 5 (v5) | ||
| 750 | kerberos-iv | Kerberos version 4 (v4) services | ||
| 765 | webster | webster dictionary | ||
| 767 | phonebook | network 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 (IRCS) over Secure Sockets Layer | ||
| 995 | pop3s | Post Office Protocol version 3 over Secure Sockets Layer (POPS3) |
UNIX-Specific Ports
The following ports are UNIX-specific and cover services ranging from email to authentication. The name in square brackets (such as [service]) is the daemon name of the service or its common alias.
| Port number / layer | Name | Comment | ||
|---|---|---|---|---|
| 512/tcp | exec | Used to authenticate remotely executed processes | ||
| 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 without login (rshell) and remote copy (rcp) |
| 514/udp | syslog | UNIX system logging service | ||
| 515 | printer [spooler] | printer (lpr) spooler | ||
| 517/udp | talk | remote talk service and clients | ||
| 518/udp | ntalk | network talk (ntalk), remote talk service and clients | ||
| 519 tcp | tempo | |||
| 520/tcp | ip | |||
| 521 | ripng | 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 Service | ||
| 543/tcp | klogin | Kerberos Version 5 (v5) remote login | ||
| 544/tcp | kshell | Kerberos Version 5 (v5) remote shell | ||
| 548 | afpovertcp | Appletalk File Editing Protocol (AFP) over Transmission Control Protocol (TCP) | ||
| 556 | remotefs [rfs_server, rfs] | Brunhoff's Remote File System (RFS) |
Registered Ports
Lists the ports submitted by the network and software community to IANA for formal registration in the port number list.
| Port Number / Layer | Name | Comment | ||
|---|---|---|---|---|
| 1080 | socks | SOCKS Network Application Proxy Service | ||
| 1236 | bvcontrol [rmtcfg] | Garcilis Packeten Remote Configuration Server | ||
| 1300 | h323hostcallsc | H.323 Host Call Security | ||
| 1433 | ms-sql-s | Microsoft SQL Server | ||
| 1434 | ms-sql-m | Microsoft SQL Monitor | ||
| 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 Service (LT2P) / Layer 2 Forwarding (L2F) | ||
| 1718 | h323gatedisc | H.323 Telecommunications Gatekeeper Discovery Mechanism | ||
| 1719 | h323gatestat | H.323 Telecommunications Gatekeeper Status | ||
| 1720 | h323hostcall | H.323 Telecommunications Host Phone Settings | ||
| 1758 | tftp-mcast | Small File FTP Multicast | ||
| 1759 | mtftp | Multicast Small File FTP (MTFTP) | ||
| 1789 | hello | Hello Router Communication Port | ||
| 1812 | radius | Radius Dial-Up Authentication and Accounting Service | ||
| 1813 | radius-acct | Radius Accounting | ||
| 1911 | mtp | Starlight Network Multimedia Transport Protocol (MTP) | ||
| 1985 | hsrp | Cisco Hot Standby Router Protocol | ||
| 1986 | licensedaemon | Cisco License Management Daemon | ||
| 1997 | gdp-port | Cisco Gateway Discovery Protocol (GDP) 2049 | nfs [nfsd] | Network File System (NFS) |
| 2102 | zephyr-srv | Zephyr Notification Transport and Delivery Server | ||
| 2103 | zephyr-clt | Zephyr serv-hm connection | ||
| 2104 | zephyr-hm | Zephyr Host Manager | ||
| 2401 | cvspserver | Concurrent Versions System (CVS) client/server operations | ||
| 2430/tcp | venus | Venus cache manager for the Coda file system (codacon port) | ||
| 2430/udp | venus | Venus cache manager for the Coda file system (callback/wbc interface) | ||
| 2431/tcp | venus-se | Venus Transmission Control Protocol (TCP) side effects | ||
| 2431/udp | venus-se | Venus User Datagram Protocol (UDP) side effects | ||
| 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 metering; RIP daemon for IPv6 2604 nsc-ccs [ospfd] NSC CCS; Open Short Path First daemon (ospfd) 2605 nsc-posa NSC POSA; Border Network Protocol daemon (bgpd) 2606 | netmon [ospf6d] | Dell Netmon; OSPF daemon (ospf6d) for IPv6 |
| 2809 | corbaloc | Common Object Request Broker Architecture (CORBA) Naming Service Locator | ||
| 3130 | icpv2 | Internet Cache Protocol version 2 (v2); used by the Squid proxy cache server | ||
| 3306 | mysql | MySQL database service | ||
| 3346 | trnsprntproxy | Trnsprnt proxy | ||
| 4011 | pxe | Pre-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 tool | ||
| 6000 | x11 [X] | X Window System Services | ||
| 7000 | afs3-fileserver | Andrew File System (AFS) file server | ||
| 7001 | afs3-callback | AFS port for calling back the Cache Manager | ||
| 7002 | afs3-prserver | AFS user and group database | ||
| 7003 | afs3-vlserver | AFS File Volume Location Database | ||
| 7004 | afs3-kaserver | AFS Kerberos Authentication Service | ||
| 7005 | afs3-volser | AFS File Volume Management Server | ||
| 7006 | afs3-errors | AFS Error Interpretation Service | ||
| 7007 | afs3-bos | AFS Basic Monitoring 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 Automatic 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 Alternation | ||
| 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 Tools | ||
| 13782 | bpcd | Vertias NetBackup | ||
| 13783 | vopied | Veritas VOPIED Protocol | ||
| 22273 | wnn6 [wnn4] | Kana/Kanji Conversion System | ||
| 26000 | quake | Quake (and related) multiplayer game servers | ||
| 26208 | wnn6-ds | |||
| 33434 | traceroute | Traceroute Network Tracing Tool | ||
| Note: The comment in /etc/services is as follows: Port 1236 is registered as "bvcontrol", but it is also used by Gracilis Used by the Packeten remote configuration server. Official names are listed as primary names, unregistered names are listed as aliases. Comment in /etc/services: Ports 2600 to 2606 are used unregistered by the zebra package. The primary names are the registered names, unregistered names used by zebra are listed as aliases. Comment in the /etc/services file: This port is registered as wnn6, but the unregistered "wnn4" is also used by the FreeWnn package. |
||||
Datagram Delivery Protocol Ports
A list of ports associated with the Datagram Delivery Protocol (DDP) is shown. DDP is used on AppleTalk networks.
| 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 | Block Information Protocol |
Kerberos (Engineering Athena/MIT) ports
and a list of ports associated with the Kerberos network authentication protocol. Where noted, v5 stands for Kerberos version 5 protocol. Note that these ports are not registered with IANA.
| Port Number/Tier | 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 Demultiplexer |
| 2105 | eklogin | Kerberos v5 encrypted remote login (rlogin) |
Unregistered Ports
A list of unregistered ports. These ports may be used by services or protocols installed on your Red Hat Enterprise Linux system, or they may be required for communication between Red Hat Enterprise Linux and machines running other operating systems.
| Port Number / Layer | Name | Comment | ||
|---|---|---|---|---|
| 15/tcp | netstat | Network Status (netstat) | ||
| 98/tcp | linuxconf | Linuxconf Linux Administration Tools | ||
| 106 | poppassd | Post Office Protocol Password Change Daemon (POPPASSD) | ||
| 465/tcp | smtps | Simple Mail Transfer Protocol over Secure Sockets Layer (SMTPS) tcp | swat | Samba World Wide Web Administration Tool (SWAT) |
| 953 | rndc | Berkeley Internet Name Domain Version 9 (BIND 9) Remote Name Daemon Configuration Tool | ||
| 1127 | sufiledbg | Software Upgrade Protocol (SUP) debugging | ||
| 1178/tcp | skkserv | Simple Kana to Kanji (SKK) Japanese input server | ||
| 1313/tcp | xtel | French Minitel text messaging 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 World Wide Web Proxy Cache | ||
| 3455 | prsvp | RSVP port | ||
| 5432 | postgres | PostgreSQL database | ||
| 4557/tcp | fax | FAX Transport 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 Logging Daemon (noclogd) | ||
| 5355 | hostmon | NOCOL Network Operations Center Host Monitor | ||
| 5680/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 | An alternative to Hypertext Transfer Protocol (HTTP) | ||
| 8080 | webcache | World Wide Web (WWW) caching service | ||
| 8081 | tproxy | Transparent proxy | ||
| 9100/tcp | jetdirect [laserjet, hplj] | Hewlett-Packard (HP) JetDirect network print service | ||
| 9359 | mandelspawn [mandelbrot] | Parallel Mandelbrot spawner for the X Window System | ||
| 10081 | kamanda | Amanda backup service using Kerberos | ||
| 10082/tcp | amandaidx | Amanda Backup Service | ||
| 10083/tcp | amidxtape | Amanda Backup Service | ||
| 20011 | isdnlog | Integrated Services Digital Network (ISDN) Login 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 (Taiwan) | ||
| 24554 | binkp | Binkley TCP/IP Fidonet mailer daemon | ||
| 27374 | asp | Address Search Protocol | ||
| 60177 | tfido | Ifmail FidoNet compatible mailing service | ||
| 60179 | fido | FidoNet Email and News Network |