What Are: Service Ports?

[OpaQue 15]

Service Ports

 

The IP address acts as a unique identifier for a computer connected to the internet. Using it, computers send data to each other. Internet is a type of network. In addition to the IP address of the remote system, an application also needs to know how to address the specific program that it wishes to communicate with. This is accomplished by specifying a service port, a 16-bit number that uniquely identifies an application running on the system. Instead of numbers, however, service names are usually used instead. Like hostnames, service names are usually matched to port numbers through a local file, commonly called services. This file lists the logical service name, followed by the port number and protocol used by the server. Cpanel : The Webhosting service provided by us has its own communication port which can be accessed by typing http://www.sitename.com/cpanel or sitename.com:portnumber.

The Default port for communication on the internet is port 80.

 

============================================

 

Since Opaque started off with a good intro - I'll just add in a complete list of TCP/IP Service Ports (standardized by the IANA) for your future reference. Here goes:

Common Ports

 

This file was taken from the IANA website. It is a list of the well known port numbers.

 

# /etc/services:

# $Id: services,v 1.4 1997/05/20 19:41:21 tobias Exp $

#

# Network services, Internet style

#

# Note that it is presently the policy of IANA to assign a single well-known

# port number for both TCP and UDP; hence, most entries here have two entries

# even if the protocol doesn't support UDP operations.

# Updated from RFC 1700, ``Assigned Numbers'' (October 1994).  Not all ports

# are included, only the more common ones.

 

 

tcpmux  1/tcp    # TCP port service multiplexer

echo  7/tcp

echo  7/udp

discard  9/tcp  sink null

discard  9/udp  sink null

systat  11/tcp  users

daytime  13/tcp

daytime  13/udp

netstat  15/tcp

qotd  17/tcp  quote

msp  18/tcp    # message send protocol

msp  18/udp    # message send protocol

chargen  19/tcp  ttytst source

chargen  19/udp  ttytst source

ftp-data 20/tcp

ftp  21/tcp

fsp  21/udp  fspd

ssh  22/tcp    # SSH Remote Login Protocol

ssh  22/udp    # SSH Remote Login Protocol

telnet  23/tcp

 

# 24 - private

 

smtp  25/tcp  mail

 

# 26 - unassigned

 

time  37/tcp  timserver

time  37/udp  timserver

rlp  39/udp  resource # resource location

nameserver 42/tcp  name  # IEN 116

whois  43/tcp  nicname

re-mail-ck 50/tcp    # Remote Mail Checking Protocol

re-mail-ck 50/udp    # Remote Mail Checking Protocol

domain  53/tcp  nameserver # name-domain server

domain  53/udp  nameserver

mtp  57/tcp    # deprecated

bootps  67/tcp    # BOOTP server

bootps  67/udp

bootpc  68/tcp    # BOOTP client

bootpc  68/udp

tftp  69/udp

gopher  70/tcp    # Internet Gopher

gopher  70/udp

rje  77/tcp  netrjs

finger  79/tcp

www  80/tcp  http  # WorldWideWeb HTTP

www  80/udp    # HyperText Transfer Protocol

link  87/tcp  ttylink

kerberos 88/tcp  kerberos5 krb5 kerberos-sec # Kerberos v5

kerberos 88/udp  kerberos5 krb5 kerberos-sec # Kerberos v5

supdup  95/tcp

 

# 100 - reserved

 

hostnames 101/tcp  hostname # usually from sri-nic

iso-tsap 102/tcp  tsap  # part of ISODE.

csnet-ns 105/tcp  cso-ns  # also used by CSO name server

csnet-ns 105/udp  cso-ns

 

# unfortunately the poppassd (Eudora) uses a port which has already

# been assigned to a different service. We list the poppassd as an

# alias here. This should work for programs asking for this service.

# (due to a bug in inetd the 3com-tsmux line is disabled)

#3com-tsmux 106/tcp  poppassd

#3com-tsmux 106/udp  poppassd

rtelnet  107/tcp    # Remote Telnet

rtelnet  107/udp

pop2  109/tcp  postoffice pop-2 # POP version 2

pop2  109/udp  pop-2

pop3  110/tcp  pop-3  # POP version 3

pop3  110/udp  pop-3

sunrpc  111/tcp  portmapper # RPC 4.0 portmapper TCP

sunrpc  111/udp  portmapper # RPC 4.0 portmapper UDP

auth  113/tcp  authentication tap ident

sftp  115/tcp

uucp-path 117/tcp

nntp  119/tcp  readnews untp # USENET News Transfer Protocol

ntp  123/tcp

ntp  123/udp    # Network Time Protocol

pwdgen  129/tcp    # PWDGEN service

pwdgen  129/udp    # PWDGEN service

netbios-ns 137/tcp    # NETBIOS Name Service

netbios-ns 137/udp

netbios-dgm 138/tcp    # NETBIOS Datagram Service

netbios-dgm 138/udp

netbios-ssn 139/tcp    # NETBIOS session service

netbios-ssn 139/udp

imap2  143/tcp  imap  # Interim Mail Access Proto v2

imap2  143/udp  imap

snmp  161/udp    # Simple Net Mgmt Proto

snmp-trap 162/udp  snmptrap # Traps for SNMP

cmip-man 163/tcp    # ISO mgmt over IP (CMOT)

cmip-man 163/udp

cmip-agent 164/tcp

cmip-agent 164/udp

mailq  174/tcp    # Mailer transport queue for Zmailer

mailq  174/udp    # Mailer transport queue for Zmailer

xdmcp  177/tcp    # X Display Mgr. Control Proto

xdmcp  177/udp

nextstep 178/tcp  NeXTStep NextStep # NeXTStep window

nextstep 178/udp  NeXTStep NextStep # server

bgp  179/tcp    # Border Gateway Proto.

bgp  179/udp

prospero 191/tcp    # Cliff Neuman's Prospero

prospero 191/udp

irc  194/tcp    # Internet Relay Chat

irc  194/udp

smux  199/tcp    # SNMP Unix Multiplexer

smux  199/udp

at-rtmp  201/tcp    # AppleTalk routing

at-rtmp  201/udp

at-nbp  202/tcp    # AppleTalk name binding

at-nbp  202/udp

at-echo  204/tcp    # AppleTalk echo

at-echo  204/udp

at-zis  206/tcp    # AppleTalk zone information

at-zis  206/udp

qmtp  209/tcp    # The Quick Mail Transfer Protocol

qmtp  209/udp    # The Quick Mail Transfer Protocol

z3950  210/tcp  wais  # NISO Z39.50 database

z3950  210/udp  wais

ipx  213/tcp    # IPX

ipx  213/udp

imap3  220/tcp    # Interactive Mail Access

imap3  220/udp    # Protocol v3

rpc2portmap 369/tcp

rpc2portmap 369/udp    # Coda portmapper

codaauth2 370/tcp

codaauth2 370/udp    # Coda authentication server

ulistserv 372/tcp    # UNIX Listserv

ulistserv 372/udp

ldap  389/tcp    # Lightweight Directory Access Protocol

ldap  389/udp    # Lightweight Directory Access Protocol

https  443/tcp    # MCom

https  443/udp    # MCom

snpp  444/tcp    # Simple Network Paging Protocol

snpp  444/udp    # Simple Network Paging Protocol

saft  487/tcp    # Simple Asynchronous File Transfer

saft  487/udp    # Simple Asynchronous File Transfer

npmp-local 610/tcp  dqs313_qmaster # npmp-local / DQS

npmp-local 610/udp  dqs313_qmaster # npmp-local / DQS

npmp-gui 611/tcp  dqs313_execd # npmp-gui / DQS

npmp-gui 611/udp  dqs313_execd # npmp-gui / DQS

hmmp-ind 612/tcp  dqs313_intercell# HMMP Indication / DQS

hmmp-ind 612/udp  dqs313_intercell# HMMP Indication / DQS

ipp  631/tcp    # Internet Printing Protocol

ipp  631/udp    # Internet Printing Protocol

 

#

# UNIX specific services

#

exec  512/tcp

biff  512/udp  comsat

login  513/tcp

who  513/udp  whod

shell  514/tcp  cmd  # no passwords used

syslog  514/udp

printer  515/tcp  spooler  # line printer spooler

talk  517/udp

ntalk  518/udp

route  520/udp  router routed # RIP

timed  525/udp  timeserver

tempo  526/tcp  newdate

courier  530/tcp  rpc

conference 531/tcp  chat

netnews  532/tcp  readnews

netwall  533/udp    # -for emergency broadcasts

gdomap  538/tcp    # GNUstep distributed objects

gdomap  538/udp    # GNUstep distributed objects

uucp  540/tcp  uucpd  # uucp daemon

afpovertcp 548/tcp    # AFP over TCP

afpovertcp 548/udp    # AFP over TCP

remotefs 556/tcp  rfs_server rfs # Brunhoff remote filesystem

klogin  543/tcp    # Kerberized `rlogin' (v5)

kshell  544/tcp  krcmd  # Kerberized `rsh' (v5)

nntps  563/tcp  snntp  # NNTP over SSL

nntps  563/udp  snntp  # NNTP over SSL

ldaps  636/tcp    # LDAP over SSL

ldaps  636/udp    # LDAP over SSL

tinc  655/tcp    # tinc control port

tinc  655/udp    # tinc packet port

kerberos-adm 749/tcp    # Kerberos `kadmin' (v5)

 

#

webster  765/tcp    # Network dictionary

webster  765/udp

rsync  873/tcp    # rsync

rsync  873/udp    # rsync

ftps-data 989/tcp    # FTP over SSL (data)

ftps  990/tcp    # FTP over SSL

telnets  992/tcp    # Telnet over SSL

telnets  992/udp    # Telnet over SSL

imaps  993/tcp    # IMAP over SSL

imaps  993/udp    # IMAP over SSL

ircs  994/tcp    # IRC over SSL

ircs  994/udp    # IRC over SSL

pop3s  995/tcp    # POP-3 over SSL

pop3s  995/udp    # POP-3 over SSL

 

#

# From ``Assigned Numbers'':

#

#> The Registered Ports are not controlled by the IANA and on most systems

#> can be used by ordinary user processes or programs executed by ordinary

#> users.

#

#> Ports are used in the TCP [45,106] to name the ends of logical

#> connections which carry long term conversations.  For the purpose of

#> providing services to unknown callers, a service contact port is

#> defined.  This list specifies the port used by the server process as its

#> contact port.  While the IANA can not control uses of these ports it

#> does register or list uses of these ports as a convienence to the

#> community.

#

socks  1080/tcp  # socks proxy server

socks  1080/udp  # socks proxy server

lotusnote      1352/tcp lotusnotes # Lotus Note

lotusnote      1352/udp lotusnotes # Lotus Note

ingreslock 1524/tcp

ingreslock 1524/udp

prospero-np 1525/tcp  # Prospero non-privileged

prospero-np 1525/udp

datametrics 1645/tcp old-radius # datametrics / old radius entry

datametrics 1645/udp old-radius # datametrics / old radius entry

sa-msg-port 1646/tcp old-radacct # sa-msg-port / old radacct entry

sa-msg-port 1646/udp old-radacct # sa-msg-port / old radacct entry

radius  1812/tcp  # Radius

radius  1812/udp  # Radius

radius-acct 1813/tcp radacct  # Radius Accounting

radius-acct 1813/udp radacct  # Radius Accounting

rtcm-sc104 2101/tcp  # RTCM SC-104 IANA 1/29/99

rtcm-sc104 2101/udp  # RTCM SC-104 IANA 1/29/99

cvspserver 2401/tcp  # CVS client/server operations

cvspserver 2401/udp  # CVS client/server operations

venus  2430/tcp  # codacon port

venus  2430/udp  # Venus callback/wbc interface

venus-se 2431/tcp  # tcp side effects

venus-se 2431/udp  # udp sftp side effect

codasrv  2432/tcp  # not used

codasrv  2432/udp  # server port

codasrv-se 2433/tcp  # tcp side effects

codasrv-se 2433/udp  # udp sftp side effect

mon  2583/tcp  # MON

mon  2583/udp  # MON

dict  2628/tcp                        # Dictionary server

dict  2628/udp                        # Dictionary server

gds_db  3050/tcp  # InterBase server

gds_db  3050/udp  # InterBase server

icpv2  3130/tcp icp  # Internet Cache Protocol (Squid)

icpv2  3130/udp icp  # Internet Cache Protocol (Squid)

mysql  3306/tcp  # MySQL

mysql  3306/udp  # MySQL

rfe  5002/tcp  # Radio Free Ethernet

rfe  5002/udp  # Actually uses UDP only

cfengine 5308/tcp  # CFengine

cfengine 5308/udp  # CFengine

x11  6000/tcp x11-0  # X windows system

x11  6000/udp x11-0  # X windows system

x11-1  6001/tcp  # X windows system

x11-1  6001/udp  # X windows system

x11-2  6002/tcp  # X windows system

x11-2  6002/udp  # X windows system

x11-3  6003/tcp  # X windows system

x11-3  6003/udp  # X windows system

x11-4  6004/tcp  # X windows system

x11-4  6004/udp  # X windows system

x11-5  6005/tcp  # X windows system

x11-5  6005/udp  # X windows system

x11-6  6006/tcp  # X windows system

x11-6  6006/udp  # X windows system

x11-7  6007/tcp  # X windows system

x11-7  6007/udp  # X windows system

afs3-fileserver 7000/tcp bbs  # file server itself

afs3-fileserver 7000/udp bbs  # file server itself

afs3-callback  7001/tcp  # callbacks to cache managers

afs3-callback  7001/udp  # callbacks to cache managers

afs3-prserver  7002/tcp  # users & groups database

afs3-prserver  7002/udp  # users & groups database

afs3-vlserver  7003/tcp  # volume location database

afs3-vlserver  7003/udp  # volume location database

afs3-kaserver  7004/tcp  # AFS/Kerberos authentication

afs3-kaserver  7004/udp  # AFS/Kerberos authentication

afs3-volser    7005/tcp  # volume managment server

afs3-volser    7005/udp  # volume managment server

afs3-errors    7006/tcp  # error interpretation service

afs3-errors    7006/udp  # error interpretation service

afs3-bos        7007/tcp  # basic overseer process

afs3-bos        7007/udp  # basic overseer process

afs3-update    7008/tcp  # server-to-server updater

afs3-update    7008/udp  # server-to-server updater

afs3-rmtsys    7009/tcp  # remote cache manager service

afs3-rmtsys    7009/udp  # remote cache manager service

font-service 7100/tcp xfs  # X Font Service

font-service 7100/udp xfs  # X Font Service

wnn6            22273/tcp  # wnn6

wnn6            22273/udp  # wnn6

 

 

#=========================================================================

# The remaining port numbers are not as allocated by IANA.

#

# Kerberos (Project Athena/MIT) services

# Note that these are for Kerberos v4, and are unofficial.  Sites running

# v4 should uncomment these and comment out the v5 entries above.

#

kerberos4 750/udp  kerberos-iv kdc # Kerberos (server) udp

kerberos4 750/tcp  kerberos-iv kdc # Kerberos (server) tcp

kerberos_master 751/udp    # Kerberos authentication

kerberos_master 751/tcp    # Kerberos authentication

passwd_server 752/udp    # Kerberos passwd server

krb_prop 754/tcp    # Kerberos slave propagation

krbupdate 760/tcp  kreg  # Kerberos registration

kpasswd  761/tcp  kpwd  # Kerberos "passwd"

swat  901/tcp    # swat

kpop  1109/tcp  # Pop with Kerberos

knetd  2053/tcp  # Kerberos de-multiplexor

zephyr-srv 2102/udp  # Zephyr server

zephyr-clt 2103/udp  # Zephyr serv-hm connection

zephyr-hm 2104/udp  # Zephyr hostmanager

eklogin  2105/tcp  # Kerberos encrypted rlogin

# Hmmm. Are we using Kv4 or Kv5 now? Worrying.

# The following is probably Kerberos v5  --- ajt@debian.org (11/02/2000)

kx  2111/tcp  # X over Kerberos

#

# Unofficial but necessary (for NetBSD) services

#

supfilesrv 871/tcp    # SUP server

supfiledbg 1127/tcp  # SUP debugging

#

# Datagram Delivery Protocol services

#

rtmp  1/ddp    # Routing Table Maintenance Protocol

nbp  2/ddp    # Name Binding Protocol

echo  4/ddp    # AppleTalk Echo Protocol

zip  6/ddp    # Zone Information Protocol

#

# Services added for the Debian GNU/Linux distribution

#

linuxconf      98/tcp                          # LinuxConf

poppassd 106/tcp    # Eudora

poppassd 106/udp    # Eudora

imsp  406/tcp    # Interactive Mail Support Protocol

imsp  406/udp    # Interactive Mail Support Protocol

ssmtp  465/tcp  smtps  # SMTP over SSL

nqs  607/tcp    # Network Queuing system

moira_db 775/tcp    # Moira database

moira_update 777/tcp    # Moira update protocol.

moira_ureg 779/udp    # Moira user registration.

omirr  808/tcp  omirrd  # online mirror

omirr  808/udp  omirrd  # online mirror

customs  1001/tcp  # pmake customs server

customs  1001/udp  # pmake customs server

rmiregistry 1099/tcp  # Java RMI Registry

skkserv        1178/tcp                        # skk jisho server port

predict  1210/udp  # predict -- satellite tracking

rmtcfg  1236/tcp  # Gracilis Packeten remote config server

xtel  1313/tcp  # french minitel

xtelw  1314/tcp  # french minitel

support  1529/tcp  # GNATS

sieve  2000/tcp  # Sieve mail filter daemon

cfinger  2003/tcp lmtp  # GNU Finger / Local Mail Transfer Protocol

ndtp  2010/tcp  # Network dictionary transfer protocol

ninstall 2150/tcp  # ninstall service

ninstall 2150/udp  # ninstall service

zebrasrv 2600/tcp  # zebra service

zebra  2601/tcp  # zebra vty

ripd  2602/tcp  # RIPd vty

ripngd  2603/tcp  # RIPngd vty

ospfd  2604/tcp  # OSPFd vty

bgpd  2605/tcp  # BGPd vty

ospf6d  2606/tcp  # OSPF6d vty

afbackup 2988/tcp  # Afbackup system

afbackup 2988/udp  # Afbackup system

afmbackup 2989/tcp  # Afmbackup system

afmbackup 2989/udp  # Afmbackup system

xtell  4224/tcp  # xtell server

fax  4557/tcp  # FAX transmission service        (old)

hylafax  4559/tcp  # HylaFAX client-server protocol  (new)

pcrd  5151/tcp  # PCR-1000 Daemon

noclog  5354/tcp  # noclogd with TCP (nocol)

noclog  5354/udp  # noclogd with UDP (nocol)

hostmon  5355/tcp  # hostmon uses TCP (nocol)

hostmon  5355/udp  # hostmon uses UDP (nocol)

postgres 5432/tcp  # POSTGRES

postgres 5432/udp  # POSTGRES

mrtd  5674/tcp  # MRT Routing Daemon

bgpsim  5675/tcp  # MRT Routing Simulator

canna          5680/tcp  # cannaserver

sane  6566/tcp saned  # SANE network scanner daemon

ircd  6667/tcp  # Internet Relay Chat

ircd  6667/udp  # Internet Relay Chat

ircd-dalnet 7000/tcp  # IRC - Dalnet

ircd-dalnet 7000/udp  # IRC - Dalnet

webcache 8080/tcp  # WWW caching service

webcache 8080/udp  # WWW caching service

tproxy  8081/tcp  # Transparent Proxy

tproxy  8081/udp  # Transparent Proxy

omniorb  8088/tcp  # OmniORB

omniorb  8088/udp  # OmniORB

mandelspawn 9359/udp mandelbrot # network mandelbrot

amanda  10080/udp  # amanda backup services

kamanda  10081/tcp  # amanda backup services (Kerberos)

kamanda  10081/udp  # amanda backup services (Kerberos)

amandaidx 10082/tcp  # amanda backup services

amidxtape 10083/tcp  # amanda backup services

smsqp  11201/tcp  # Alamin SMS gateway

smsqp  11201/udp  # Alamin SMS gateway

xpilot  15345/tcp  # XPilot Contact Port

xpilot  15345/udp  # XPilot Contact Port

isdnlog  20011/tcp  # isdn logging system

isdnlog  20011/udp  # isdn logging system

vboxd  20012/tcp  # voice box system

vboxd  20012/udp  # voice box system

binkp  24554/tcp  # Binkley

binkp  24554/udp  # Binkley

asp  27374/tcp  # Address Search Protocol

asp  27374/udp  # Address Search Protocol

dircproxy 57000/tcp  # Detachable IRC Proxy

tfido  60177/tcp  # Ifmail

tfido  60177/udp  # Ifmail

fido  60179/tcp  # Ifmail

fido  60179/udp  # Ifmail

 

Source: http://forums.xisto.com/no_longer_exists/

Edited March 17, 2005 by microscopic^earthling (see edit history)

[bchs 0]

What is the port for AIM and instant messengars alike. They have been banned for using them in the library but student still sneak them behind them behind our backs but if we block the port our worries are over. Can any one help with this probleme.

[Eric Straven 0]

Bchs, if the computers are using Windows XP, then you can just use the ICF(Internet Connection Firewall), otherwise you can just download a free firewall and block the ports you want to block....And about the port for AIM thing...If you have ZoneAlarm Pro or Security Suite, you will notice that it changes port number constantly every time it tries to connect...But if you use ZoneAlarm Pro or Security Suite, you can block access to the internet to selected programs...

[OpaQue 15]

I don't know much about those, but Currently , I am using Windows XP w/ Service Pack 2 and it usually asks me to unblock or Block a port whenever it encounters any such things. For some applications, I unblocked the port and they are all running successfully.For messengers, I recommend GAIM. It can connect to everything simultaneously.

[daniel151405241469 0]

Ports used by instant messengers:Msn Messenger: 6891 (but port 1863 is used to log on)ICQ: 5190Yahoo: 5050 (port 80 used sometimes)these are the only ones i know since i don't use any others. yahoo messenger would be pretty hard to block on a firewall since you can configure it to use port 80 (standard www port)oh, by the way for OpaQue: the port for cPanel is 2082 (or 2083 for https access)

[iGuest 3]

ok is there any way that i can like change my default transfer port 80 to some other port ? and can i simultaneasly send files via MSN and YAhoo meessengeer casue they both use defaullt 80 port

[OrbitPoints 0]

What is the port for AIM and instant messengars alike.

They have been banned for using them in the library but student still sneak them behind them behind our backs but if we block the port our worries are over. Can any one help with this probleme.

<{POST_SNAPBACK}>

I think an easier way to block them is redirect msg.dcn.yahoo.com to 127.0.0.1

could use HOSTS file. or restrict msg.dcn.yahoo.com using a proxy server.

[Hercco 0]

The Default port for communication on the internet is port 80.

<{POST_SNAPBACK}>

80 is the default port for http. So to be accurate it is the default port of unsecured www. It is the port where webservers are usually configured to.

 

Other typical default ports are for example 21 for FTP, 22 for SSH, 23 for Telnet and 6667 for IRC.

 

 

ok is there any way that i can like change my default transfer port 80 to some other port ? and can i simultaneasly send files via MSN and YAhoo meessengeer casue they both use defaullt 80 port

<{POST_SNAPBACK}>

Change the default port of what?

And I doubt that both MSN and Yahoo will work if they are using port 80.

[happydude 0]

80 is the default port for http. So to be accurate it is the default port of unsecured www. It is the port where webservers are usually configured to.

 

Other typical default ports are for example 21 for FTP,  22 for SSH, 23 for Telnet and 6667 for IRC.

Change the default port of what?

And I doubt that both MSN and Yahoo will work if they are using port 80.

<{POST_SNAPBACK}>

8080 and 1080 also work for http (usually proxies)

[Hercco 0]

8080 and 1080 also work for http (usually proxies)

<{POST_SNAPBACK}>

Well practically any port number works for http. It is just common habit that if you configure a second or thrid webserver to work from the same address you use xx80 ports.