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TCP UDP Port Numbers
TCP and UDP are both transport protocols above the IP layer, which are interfaces between IP and upper-layer processes. TCP and UDP protocol port numbers are designed to distinguish multiple applications running on a single device from one another.
Since many network applications may be running on the same machine, computers need something to make sure the correct software application on the destination computer gets the data packets from the source machine, and some way to make sure replies get routed to the correct application on the source computer. This is accomplished through the use of the TCP or UDP "port numbers". In the TCP and UDP header, there are "Source Port" and "Destination Port" fields which are used to indicate the message sending process and receiving process identities defined. The combination of the IP address and the port number is called "socket".
There three port ranges defined by IETF IANA: The Well Known Ports, the Registered Ports, and the Dynamic and/or Private Ports.
- The Well Known Ports are those from 0 through 1023.
- The Registered Ports are those from 1024 through 49151.
- The Dynamic and/or Private Ports are those from 49152 through 65535
Partial TCP UDP Port Numbers Well-Known Ports
|
Port No.
|
Protocol
|
Service Name
| Aliases |
Comment |
|
7 |
TCP |
echo |
|
Echo |
|
7 |
UDP |
echo |
|
Echo |
|
9 |
TCP |
discard |
sink null |
Discard |
|
9 |
UDP |
discard |
sink null |
Discard |
|
13 |
TCP |
daytime |
|
Daytime |
|
13 |
UDP |
daytime |
|
Daytime |
|
17 |
TCP |
qotd |
quote |
Quote of the day |
|
17 |
UDP |
qotd |
quote |
Quote of the day |
|
19 |
TCP |
chargen |
ttytst source |
Character generator |
|
19 |
UDP |
chargen |
ttytst source |
Character generator |
|
20 |
TCP |
ftp-data |
|
File Transfer |
|
21 |
TCP |
ftp |
|
FTP Control |
|
23 |
TCP |
telnet |
|
Telnet |
|
25 |
TCP |
smtp |
mail |
Simple Mail Transfer |
|
37 |
TCP |
time |
|
Time |
|
37 |
UDP |
time |
|
Time |
|
39 |
UDP |
rlp |
resource |
Resource Location Protocol |
|
42 |
TCP |
nameserver |
name |
Host Name Server |
|
42 |
UDP |
nameserver |
name |
Host Name Server |
|
43 |
TCP |
nicname |
whois |
Who Is |
|
53 |
TCP |
domain |
|
Domain Name |
|
53 |
UDP |
domain |
|
Domain Name Server |
|
67 |
UDP |
bootps |
dhcps |
Bootstrap Protocol Server |
|
68 |
UDP |
bootpc |
dhcpc |
Bootstrap Protocol Client |
|
69 |
UDP |
tftp |
|
Trivial File Transfer |
|
70 |
TCP |
gopher |
|
Gopher |
|
79 |
TCP |
finger |
|
Finger |
|
80 |
TCP |
http |
www, http |
World Wide Web |
|
88 |
TCP |
kerberos |
krb5 |
Kerberos |
|
88 |
UDP |
kerberos |
krb5 |
Kerberos |
|
101 |
TCP |
hostname |
hostnames |
NIC Host Name Server |
|
102 |
TCP |
iso-tsap |
|
ISO-TSAP Class 0 |
|
107 |
TCP |
rtelnet |
|
Remote Telnet Service |
|
109 |
TCP |
pop2 |
postoffice |
Post Office Protocol - Version 2 |
|
110 |
TCP |
pop3 |
postoffice |
Post Office Protocol - Version 3 |
|
111 |
TCP |
sunrpc |
rpcbind portmap |
SUN Remote Procedure Call |
|
111 |
UDP |
sunrpc |
rpcbind portmap |
SUN Remote Procedure Call |
|
113 |
TCP |
auth |
ident tap |
Authentication Sevice |
|
117 |
TCP |
uucp-path |
|
UUCP Path Service |
|
119 |
TCP |
nntp |
usenet |
Network News Transfer Protocol |
|
123 |
UDP |
ntp |
|
Network Time Protocol |
|
135 |
TCP |
epmap |
loc-srv |
DCE endpoint resolution |
|
135 |
UDP |
epmap |
loc-srv |
DCE endpoint resolution |
|
137 |
TCP |
netbios-ns |
nbname |
NETBIOS Name Service |
|
137 |
UDP |
netbios-ns |
nbname |
NETBIOS Name Service |
|
138 |
UDP |
netbios-dgm |
nbdatagram |
NETBIOS Datagram Service |
|
139 |
TCP |
netbios-ssn |
nbsession |
NETBIOS Session Service |
|
143 |
TCP |
imap |
imap4 |
Internet Message Access Protocol |
|
158 |
TCP |
pcmail-srv |
repository |
PC Mail Server |
|
161 |
UDP |
snmp |
snmp |
SNMP |
|
162 |
UDP |
snmptrap |
snmp-trap |
SNMP TRAP |
|
170 |
TCP |
print-srv |
|
Network PostScript |
|
179 |
TCP |
bgp |
|
Border Gateway Protocol |
|
194 |
TCP |
irc |
|
Internet Relay Chat Protocol |
|
213 |
UDP |
ipx |
|
IPX over IP |
|
389 |
TCP |
ldap |
|
Lightweight Directory Access Protocol |
|
443 |
TCP |
https |
MCom |
|
|
443 |
UDP |
https |
MCom |
|
|
445 |
TCP |
|
|
Microsoft CIFS |
|
445 |
UDP |
|
|
Microsoft CIFS |
|
464 |
TCP |
kpasswd |
|
Kerberos (v5) |
|
464 |
UDP |
kpasswd |
|
Kerberos (v5) |
|
500 |
UDP |
isakmp |
ike |
Internet Key Exchange (IPSec) |
|
512 |
TCP |
exec |
|
Remote Process Execution |
|
512 |
UDP |
biff |
comsat |
Notifies users of new mail |
|
513 |
TCP |
login |
|
Remote Login |
|
513 |
UDP |
who |
whod |
Database of who's logged on, average load |
|
514 |
TCP |
cmd |
shell |
Automatic Authentication |
|
514 |
UDP |
syslog |
|
|
|
515 |
TCP |
printer |
spooler |
Listens for incoming connections |
|
517 |
UDP |
talk |
|
Establishes TCP Connection |
|
518 |
UDP |
ntalk |
|
|
|
520 |
TCP |
efs |
|
Extended File Name Server |
|
520 |
UDP |
router |
router routed |
RIPv.1, RIPv.2 |
|
525 |
UDP |
timed |
timeserver |
Timeserver |
|
526 |
TCP |
tempo |
newdate |
Newdate |
|
530 |
TCP,UDP |
courier |
rpc |
RPC |
|
531 |
TCP |
conference |
chat |
IRC Chat |
|
532 |
TCP |
netnews |
readnews |
Readnews |
|
533 |
UDP |
netwall |
|
For emergency broadcasts |
|
540 |
TCP |
uucp |
uucpd |
Uucpd |
|
543 |
TCP |
klogin |
|
Kerberos login |
|
544 |
TCP |
kshell |
krcmd |
Kerberos remote shell |
|
550 |
UDP |
new-rwho |
new-who |
New-who |
|
556 |
TCP |
remotefs |
rfs rfs_server |
Rfs Server |
|
560 |
UDP |
rmonitor |
rmonitord |
Rmonitor |
|
561 |
UDP |
monitor |
|
|
|
636 |
TCP |
ldaps |
sldap |
LDAP over TLS/SSL |
|
749 |
TCP |
kerberos-adm |
|
Kerberos administration |
|
749 |
UDP |
kerberos-adm |
|
Kerberos administration |
Related Protocols
IP , IPv6 , TCP , UDP
Sponsor Source
TCP and UDP port numbers are defined by IETF (http://www.ietf.org ).
Reference
http://www.iana.org/assignments/port-numbers : TCP and UDP port numbers |
