Common TCP/UDP Ports Used By Red Hat Enterprise Linux (RHEL/centOS)

Red Hat Enterprise Linux depends on access to many TCP and UDP ports to function. RHEL also includes numerous software programs that require access to these communication ports.

Below, you’ll find comprehensive lists of the most common TCP and UDP ports used in RHEL. For an up-to-date complete list of TCP and UDP ports registered with the IANA, please see the official IANA site. Keep in mind though, that the IANA list only includes registered ports. Any software you are working with could require one or more unregistered ports. Neither the ports nor any documentation on their uses will be found on the IANA registry.

Port Layer Name Description
1 TCP tcpmux TCP port service multiplexer
5 TCP rje Remote Job Entry
7 TCP echo Echo service
9 TCP discard Null service for connection testing
11 TCP systat System Status service for listing connected ports
13 TCP daytime Sends date and time to requesting host
17 TCP qotd Sends quote of the day to connected host
18 TCP msp Message Send Protocol
19 TCP chargen Character Generation service; sends endless stream of characters
20 TCP ftp-data FTP data port
21 TCP ftp File Transfer Protocol (FTP) port; sometimes used by File Service Protocol (FSP)
22 TCP ssh Secure Shell (SSH) service
23 TCP telnet The Telnet service
25 TCP smtp Simple Mail Transfer Protocol (SMTP)
37 TCP time Time Protocol
39 TCP rlp Resource Location Protocol
42 TCP nameserver Internet Name Service
43 TCP nicname WHOIS directory service
49 TCP tacacs Terminal Access Controller Access Control System for TCP/IP based authentication and access
50 TCP re-mail-ck Remote Mail Checking Protocol
53 TCP domain domain name services (such as BIND)
63 TCP whois++ WHOIS++, extended WHOIS services
67 TCP bootps Bootstrap Protocol (BOOTP) services; also used by Dynamic Host Configuration Protocol (DHCP) services
68 TCP bootpc Bootstrap (BOOTP) client; also used by Dynamic Host Control Protocol (DHCP) clients
69 TCP tftp Trivial File Transfer Protocol (TFTP)
70 TCP gopher Gopher Internet document search and retrieval
71 TCP netrjs-1 Remote Job Service
72 TCP netrjs-2 Remote Job Service
73 TCP netrjs-3 Remote Job Service
73 TCP netrjs-4 Remote Job Service
79 TCP finger Finger service for user contact information
80 TCP http HyperText Transfer Protocol (HTTP) for World Wide Web (WWW) services
88 TCP kerberos Kerberos network authentication system
95 TCP supdup Telnet protocol extension
101 TCP hostname Hostname services on SRI-NIC machines
102 TCP iso-tsap ISO Development Environment (ISODE) network applications
105 TCP csnet-ns Mailbox nameserver; also used by CSO nameserver
107 TCP rtelnet Remote Telnet
109 TCP pop2 Post Office Protocol version 2
110 TCP POP3 Post Office Protocol version 3
111 TCP sunrpc Remote Procedure Call (RPC) Protocol for remote command execution, used by Network Filesystem (NFS)
113 TCP auth Authentication and Ident protocols
115 TCP sftp Secure File Transfer Protocol (SFTP) services
117 TCP uucp-path Unix-to-Unix Copy Protocol (UUCP) Path services
119 TCP nntp Network News Transfer Protocol (NNTP) for the USENET discussion system
123 TCP ntp Network Time Protocol (NTP)
137 TCP netbios-ns NETBIOS Name Service used in Red Hat Enterprise Linux by Samba
138 TCP netbios-dgm NETBIOS Datagram Service used in Red Hat Enterprise Linux by Samba
139 TCP netbios-ssn NETBIOS Session Service used in Red Hat Enterprise Linux by Samba
143 TCP IMAP Internet Message Access Protocol (IMAP)
161 TCP snmp Simple Network Management Protocol (SNMP)
162 TCP snmptrap Traps for SNMP
163 TCP cmip-man Common Management Information Protocol (CMIP)
164 TCP cmip-agent Common Management Information Protocol (CMIP)
174 TCP mailq MAILQ email transport queue
177 TCP xdmcp X Display Manager Control Protocol (XDMCP)
178 TCP nextstep NeXTStep window server
179 TCP bgp Border Gateway Protocol
191 TCP prospero Prospero distributed filesystem services
194 TCP irc Internet Relay Chat (IRC)
199 TCP smux SNMP UNIX Multiplexer
201 TCP at-rtmp AppleTalk routing
202 TCP at-nbp AppleTalk name binding
204 TCP at-echo AppleTalk echo
206 TCP at-zis AppleTalk zone information
209 TCP qmtp Quick Mail Transfer Protocol (QMTP)
210 TCP z39.50 NISO Z39.50 database
213 TCP ipx Internetwork Packet Exchange (IPX), a datagram protocol commonly used in Novell Netware environments
220 TCP IMAP3 Internet Message Access Protocol version 3
245 TCP link LINK / 3-DNS iQuery service
347 TCP fatserv FATMEN file and tape management server
363 TCP rsvp_tunnel RSVP Tunnel
369 TCP rpc2portmap Coda file system portmapper
370 TCP codaauth2 Coda file system authentication services
372 TCP ulistproc UNIX LISTSERV
389 TCP ldap Lightweight Directory Access Protocol (LDAP)
427 TCP svrloc Service Location Protocol (SLP)
434 TCP mobileip-agent Mobile Internet Protocol (IP) agent
435 TCP mobilip-mn Mobile Internet Protocol (IP) manager
443 TCP https Secure Hypertext Transfer Protocol (HTTP)
444 TCP snpp Simple Network Paging Protocol
445 TCP microsoft-ds Server Message Block (SMB) over TCP/IP
464 TCP kpasswd Kerberos password and key changing services
468 TCP photuris Photuris session key management protocol
487 TCP saft Simple Asynchronous File Transfer (SAFT) protocol
488 TCP gss-http Generic Security Services (GSS) for HTTP
496 TCP pim-rp-disc Rendezvous Point Discovery (RP-DISC) for Protocol Independent Multicast (PIM) services
500 TCP isakmp Internet Security Association and Key Management Protocol (ISAKMP)
535 TCP iiop Internet Inter-Orb Protocol (IIOP)
538 TCP gdomap GNUstep Distributed Objects Mapper (GDOMAP)
546 TCP dhcpv6-client Dynamic Host Configuration Protocol (DHCP) version 6 client
547 TCP dhcpv6-server Dynamic Host Configuration Protocol (DHCP) version 6 Service
554 TCP rtsp Real Time Stream Control Protocol (RTSP)
563 TCP nntps Network News Transport Protocol over Secure Sockets Layer (NNTPS)
565 TCP whoami whoami user ID listing
587 TCP submission Mail Message Submission Agent (MSA)
610 TCP npmp-local Network Peripheral Management Protocol (NPMP) local / Distributed Queueing System (DQS)
611 TCP npmp-gui Network Peripheral Management Protocol (NPMP) GUI / Distributed Queueing System (DQS)
612 TCP hmmp-ind HyperMedia Management Protocol (HMMP) Indication / DQS
631 TCP ipp Internet Printing Protocol (IPP)
636 TCP ldaps Lightweight Directory Access Protocol over Secure Sockets Layer (LDAPS)
674 TCP acap Application Configuration Access Protocol (ACAP)
694 TCP ha-cluster Heartbeat services for High-Availability Clusters
749 TCP kerberos-adm Kerberos version 5 (v5) ‘kadmin’ database administration
750 TCP kerberos-iv Kerberos version 4 (v4) services
765 TCP webster Network Dictionary
767 TCP phonebook Network Phonebook
873 TCP rsync rsync file transfer services
992 TCP telnets Telnet over Secure Sockets Layer (TelnetS)
993 TCP IMAPS Internet Message Access Protocol over Secure Sockets Layer (IMAPS)
994 TCP ircs Internet Relay Chat over Secure Sockets Layer (IRCS)
995 TCP POP3s Post Office Protocol version 3 over Secure Sockets Layer (POP3S)

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UNIX-Specific Ports

Port Layer Name Description
512 TCP exec Authentication for remote process execution
512 UDP biff [comsat] Asynchrous mail client (biff) and service (comsat)
513 TCP login Remote Login (rlogin)
513 UDP who [whod] whod user logging daemon
514 TCP shell [cmd] Remote shell (rshell) and remote copy (rcp) with no logging
514 UDP syslog UNIX system logging service
515 printer [spooler] Line printer (lpr) spooler
517 UDP talk Talk remote calling service and client
518 UDP ntalk Network talk (ntalk) remote calling service and client
519 utime [unixtime] UNIX time (utime) protocol
520 TCP efs Extended Filename 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 newsgroup service
533 UDP netwall Netwall for emergency broadcasts
540 TCP uucp [uucpd] UNIX-to-UNIX copy services
543 TCP klogin Kerberos version 5 (v5) remote login
544 TCP kshell Kerberos version 5 (v5) remote shell
548 afpovertcp Appletalk Filing Protocol (AFP) over Transmission Control Protocol (TCP)
556 remotefs [rfs_server, rfs] Brunhoff’s Remote Filesystem (RFS)

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Ports Submitted To IANA By Network Community

Port Layer Name Comment
1080 socks SOCKS network application proxy services
1236 bvcontrol [rmtcfg] Remote configuration server for Gracilis Packeten network switches[a]
1300 h323hostcallsc H.323 telecommunication Host Call Secure
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 services
1525 prospero-np Prospero non-privileged
1645 datametrics [old-radius] Datametrics / old radius entry
1646 sa-msg-port [oldradacct] sa-msg-port / old radacct entry
1649 kermit Kermit file transfer and management service
1701 l2tp [l2f] Layer 2 Tunneling Protocol (LT2P) / Layer 2 Forwarding (L2F)
1718 h323gatedisc H.323 telecommunication Gatekeeper Discovery
1719 h323gatestat H.323 telecommunication Gatekeeper Status
1720 h323hostcall H.323 telecommunication Host Call setup
1758 tftp-mcast Trivial FTP Multicast
1759 UDP mtftp Multicast Trivial FTP (MTFTP)
1789 hello Hello router communication protocol
1812 radius Radius dial-up authentication and accounting services
1813 radius-acct Radius Accounting
1911 mtp Starlight Networks 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 distributed messaging Server
2103 zephyr-clt Zephyr client
2104 zephyr-hm Zephyr host manager
2401 cvspserver Concurrent Versions System (CVS) client/server operations
2430 TCP venus Venus cache manager for Coda file system (codacon port)
2430 UDP venus Venus cache manager for 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 effects
2433 UDP codasrv-se Coda file system UDP SFTP side effect
2600 hpstgmgr [zebrasrv] Zebra routing[b]
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 for IPv6 daemon (ospf6d)
2809 corbaloc Common Object Request Broker Architecture (CORBA) naming service locator
3130 icpv2 Internet Cache Protocol version 2 (v2); used by Squid proxy caching server
3306 mysql MySQL database service
3346 trnsprntproxy Transparent 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 translator
5002 rfe Radio Free Ethernet (RFE) audio broadcasting system
5308 cfengine Configuration engine (Cfengine)
5999 cvsup [CVSup] CVSup file transfer and update tool
6000 TCP x11 [X] X Window System services
7000 afs3-fileserver Andrew File System (AFS) file server
7001 afs3-callback AFS port for callbacks to cache manager
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 for IP multicast conferencing
10080 amanda Advanced Maryland Automatic Network Disk Archiver (Amanda) backup services
11371 pgpkeyserver Pretty Good Privacy (PGP) / GNU Privacy Guard (GPG) public keyserver
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 utility
13782 bpcd Veritas NetBackup
13783 vopied Veritas VOPIE authentication daemon
22273 wnn6 [wnn4] Kana/Kanji conversion system
26000 quake Quake (and related) multi-player game servers
26208 wnn6-ds Wnn6 Kana/Kanji server
33434 traceroute Traceroute network tracking tool

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Red Hat Enterprise Linux (RHEL) Ports

Port Layer Name Comment
15 tcp netstat Network Status (netstat)
98 tcp linuxconf Linuxconf Linux administration 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 Gated (routing daemon) Interactive Interface
808 omirr [omirrd] Online Mirror (Omirr) file mirroring services
871 tcp supfileserv Software Upgrade Protocol (SUP) server
901 tcp swat Samba Web Administration Tool (SWAT)
953 rndc Berkeley Internet Name Domain version 9 (BIND 9) remote configuration tool
1127 tcp supfiledbg Software Upgrade 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
2150 ninstall Network Installation Service
2988 afbackup afbackup client-server backup system
3128 tcp squid Squid Web proxy cache
3455 prsvp 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 operation center logging daemon (noclogd)
5355 hostmon NOCOL network operation center host monitoring
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 Hypertext Tranfer Protocol (HTTP) alternate
8080 webcache World Wide Web (WWW) caching service
8081 tproxy Transparent Proxy
9100 tcp jetdirect [laserjet, hplj] Hewlett-Packard (HP) JetDirect network printing service
9359 mandelspawn [mandelbrot] Parallel mandelbrot spawning program for the X Window System
10081 kamanda Amanda backup service over Kerberos
10082 tcp amandaidx Amanda index server
10083 tcp amidxtape Amanda tape server
20011 isdnlog Integrated Services Digital Network (ISDN) logging system
20012 vboxd ISDN voice box 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 mailer service
60179 fido FidoNet electronic mail and news network

Something missing? Help us add to this resource by commenting below or contacting the editor, Bryan Kim.

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