HTTP, TCP, UDP Linux common port queries
Listed below are the most common communication ports used by services, daemons, and programs included in Red Hat Enterprise Linux.
You can check the /etc/services file. Each line gives the server name and well-known port number.
Because there are many ports, you can use the grep command to assist
You can check the /etc/services file. Each line gives the server name and well-known port number.
Because there are many ports, you can use the grep command to assist
| Port number/layer | Name | Comment |
|---|---|---|
| 1 | tcpmux | TCP port service multiplexing |
| 5 | rje | Remote job entrance |
| 7 | echo | Echo service |
| 9 | discard | Empty service for connection testing |
| 11 | systat | Used to enumerate the system status of connected ports |
| 13 | daytime | Send the date and time to the requesting host |
| 17 | qotd | Send a daily quote to the connected host |
| 18 | msp | Message sending protocol |
| 19 | chargen | Character generation service; sends an endless stream of characters |
| 20 | ftp-data | FTP data port |
| 21 | ftp | File Transfer Protocol (FTP) port; sometimes used by File Services Protocol (FSP) |
| 22 | ssh | Secure Shell (SSH) service |
| 23 | telnet | Telnet service |
| 25 | smtp | Simple Mail Transfer Protocol (SMTP) |
| 37 | time | Time agreement |
| 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 Checking Protocol |
| 53 | domain | Domain name services (such as BIND) |
| 63 | whois++ | WHOIS++, the 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 Dynamic Host Configuration Protocol (DHCP) client |
| 69 | tftp | Small File Transfer Protocol (TFTP) |
| 70 | gopher | Gopher Internet document search and retrieval |
| 71 | netrjs-1 | Remote operation service |
| 72 | netrjs-2 | Remote operation service |
| 73 | netrjs-3 | Remote operation service |
| 73 | netrjs-4 | Remote operation 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 machine |
| 102 | iso-tsap | ISO Development Environment (ISODE) Web 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 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 | NET BIOS 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 pitfalls |
| 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 network protocol |
| 191 | prospero | Cliffod Neuman's Prospero Services |
| 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 | Quick Mail Transfer Protocol (QMTP) |
| 210 | z39.50 | NISO Z39.50 database |
| 213 | ipx | Internetwork Packet Exchange (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 verification service |
| 372 | ulistproc | UNIX Listserv |
| 389 | ldap | Lightweight Directory Access Protocol (LDAP) |
| 427 | svrloc | Service Location Agreement (SLP) |
| 434 | mobileip-agent | Removable Internet Protocol (IP) proxy |
| 435 | mobilip-mn | Removable 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 replacement 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 | Rendezvous Point Discovery (RP-DISC) for Protocol Independent Multicast (PIM) Services |
| 500 | isakmp | Internet Security Association and Key Management Protocol (ISAKMP) |
| 535 | iiop | Internet Internal Object Request Proxy 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 service |
| 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 instructions/DQS |
| 631 | ipp | Internet Printing Protocol (IPP) |
| 636 | ldaps | Lightweight Directory Access Protocol (LDAPS) over Secure Sockets Layer |
| 674 | acap | Application Configuration Access Protocol (ACAP) |
| 694 | ha-cluster | Heartbeat service for clusters with high availability |
| 749 | kerberos-adm | "kadmin" database management for Kerberos version 5 (v5) |
| 750 | kerberos-iv | Kerberos version 4 (v4) service |
| 765 | webster | Online dictionary |
| 767 | phonebook | Internet phone book |
| 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 (POPS3) over Secure Sockets Layer |
| Port number/layer | Name | Comment |
|---|---|---|
| 512/tcp | exec | Used to verify 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 (rshell) and remote copy (rcp) without login |
| 514/udp | syslog | UNIX system log service |
| 515 | printer [spooler] | Printer (lpr) spool |
| 517/udp | talk | Remote conversation services and clients |
| 518/udp | ntalk | Ntalk, remote conversation services and clients |
| 519 | utime [unixtime] | UNIX Time Protocol (utime) |
| 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 |
| 533/udp | netwall | Netwall for emergency broadcasts |
| 540/tcp | uucp [uucpd] | Unix to Unix replication service |
| 543/tcp | klogin | Kerberos version 5 (v5) remote login |
| 544/tcp | kshell | Kerberos version 5 (v5) remote shell |
| 548 | afpovertcp | Appletalk File Formulation 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 web application proxy service |
| 1236 | bvcontrol [rmtcfg] | Garcilis Packeten remote configuration server |
| 1300 | h323hostcallsc | H.323 conference call host phone security |
| 1433 | ms-sql-s | Microsoft SQL server |
| 1434 | ms-sql-m | Microsoft SQL Monitor |
| 1494 | ica | Citrix ICA customers |
| 1512 | wins | Microsoft Windows Internet Name Server |
| 1524 | ingreslock | Ingres Database Management System (DBMS) Locking 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 Telecom 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 Transfer 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 Version System (CVS) client/server operation |
| 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 | Side effects of Venus Transmission Control Protocol (TCP) |
| 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 Effects |
| 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 for IPv6 (ospf6d) |
| 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 callbacks to 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 Automated Network Disk Archiver (Amanda) Backup Service |
| 11371 | pgpkeyserver | 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 tracking tool |
|
Notice: The note in /etc/services reads: Port 1236 is registered as "bvcontrol", but it is also used by the Gracilis Packeten remote configuration server. Official names are listed as primary names and unregistered names are listed as aliases. Note in /etc/services: Ports 2600 to 2606 are used by the zebra package without registration. The primary name is the registered name, unregistered names used by zebra are listed as aliases. Note in the /etc/services file: The port is registered as wnn6, but the unregistered "wnn4" is also used in the FreeWnn package. |
||
| 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 |
| 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 demultiplexer |
| 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 (SMTPS) over Secure Sockets Layer |
| 616/tcp | gii | Using the gateway's (routing daemon) interactive interface |
| 808 | omirr [omirrd] | Online Mirror (Omirr) file mirroring service |
| 871/tcp | supfileserv | Software Upgrade Protocol (SUP) Server |
| 901/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 services |
| 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 (Legacy 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 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 | 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 Printing Service |
| 9359 | mandelspawn [mandelbrot] | Parallel Mandelbrot generator 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 |