PORT NUMBERS

(last updated 2008-04-10)

The port numbers are divided into three ranges: the Well
Known Ports,the Registered Ports, and the Dynamic and/or
Private Ports.
The Well Known Ports are those from 0 through 1023.

DCCP Well Known ports SHOULD NOT be used without IANA
registration. The registration procedure is defined in
 [RFC4340], Section 19.9.

The Registered Ports are those from 1024 through 49151

DCCP Registered ports SHOULD NOT be used without IANA
registration.The registration procedure is defined in
[RFC4340], Section 19.9.

The Dynamic and/or Private Ports are those from 49152
through 65535

A value of 0 in the port numbers registry below indicates
that no port has been allocated.

****************************************************************
* PLEASE NOTE THE FOLLOWING:                                   *          *
*                                                              *        *
* IESG STATEMENT TO THE IANA                                   *        *
* THE IESG BELIEVES THAT IANA MAY ALLOCATE AN ADDITIONAL       *
*    PORT IN THE 'USER PORT' RANGE TO PROTOCOLS WHOSE CURRENT  *
*    PORT ALLOCATION REQUIRES ACCESS TO A PRIVILEGED PORT.     *
*    THIS ALLOCATION SHOULD NOT BE AUTOMATIC, BUT MAY OCCUR    *
*    UPON APPLICATION BY AN INTERESTED PARTY WHOSE APPLICATION *
*    WOULD OTHERWISE FIT IANA'S POLICIES.                      *
*                                                              *
* 1. UNASSIGNED PORT NUMBERS SHOULD NOT BE USED.  THE          *
*    IANA WILL ASSIGN THE NUMBER FOR THE PORT AFTER YOUR       *
*    APPLICATION HAS BEEN APPROVED.                            *
*                                                              *
* 2. ASSIGNMENT OF A PORT NUMBER DOES NOT IN ANY WAY IMPLY AN  *
*    ENDORSEMENT OF AN APPLICATION OR PRODUCT, AND THE FACT    *
*    THAT NETWORK TRAFFIC IS FLOWING TO OR FROM A REGISTERED   *
*    PORT DOES NOT MEAN THAT  IT IS "GOOD" TRAFFIC. FIREWALL   *
*    AND SYSTEM ADMINISTRATORS SHOULD CHOOSE HOW TO CONFIGURE  *
*    THEIR SYSTEMS BASED ON THEIR KNOWLEDGE OF THE TRAFFIC IN  *
*    QUESTION, NOT WHETHER THERE IS A PORT NUMBER REGISTERED   *
*    OR NOT.                                                   *
****************************************************************


WELL KNOWN PORT NUMBERS

The Well Known Ports are assigned by the IANA and on most
systems can only be used by system (or root) processes or
by programs executed by privileged users.

Ports are used in the TCP [RFC793] 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. 
The contact port is sometimes called the "well-known port".

To the extent possible, these same port assignments are
used with the UDP [RFC768].

The range for assigned ports managed by the IANA is 0-1023.

Port Assignments:

Keyword         Decimal    Description                     References
-------         -------    -----------                     ----------
               0/tcp    Reserved
               0/udp    Reserved
#                          Jon Postel 
spr-itunes        0/tcp    Shirt Pocket netTunes
spl-itunes        0/tcp    Shirt Pocket launchTunes
#                          David Nanian  28 September 2007
tcpmux            1/tcp    TCP Port Service Multiplexer
tcpmux            1/udp    TCP Port Service Multiplexer
#                          Mark Lottor 
compressnet       2/tcp    Management Utility
compressnet       2/udp    Management Utility
compressnet       3/tcp    Compression Process
compressnet       3/udp    Compression Process
#                          Bernie Volz 
#                 4/tcp    Unassigned
#                 4/udp    Unassigned
rje               5/tcp    Remote Job Entry
rje               5/udp    Remote Job Entry
#                          Jon Postel 
#                 6/tcp    Unassigned
#                 6/udp    Unassigned
echo              7/tcp    Echo
echo              7/udp    Echo
#                          Jon Postel 
#                 8/tcp    Unassigned
#                 8/udp    Unassigned
discard           9/tcp    Discard
discard           9/udp    Discard
#                          Jon Postel 
discard           9/sctp   Discard
#                          IETF TSVWG
#                          Randall Stewart 
#                          [RFC4960]
discard           9/dccp   Discard SC:DISC
#                          IETF dccp WG, Eddie Kohler ,
                                            [RFC4340]
#                10/tcp    Unassigned
#                10/udp    Unassigned
systat           11/tcp    Active Users
systat           11/udp    Active Users
#                          Jon Postel 
#                12/tcp    Unassigned
#                12/udp    Unassigned
daytime          13/tcp    Daytime (RFC 867)
daytime          13/udp    Daytime (RFC 867)
#                          Jon Postel 
#                14/tcp    Unassigned
#                14/udp    Unassigned
#                15/tcp    Unassigned [was netstat]
#                15/udp    Unassigned
#                16/tcp    Unassigned
#                16/udp    Unassigned
qotd             17/tcp    Quote of the Day
qotd             17/udp    Quote of the Day
#                          Jon Postel 
msp              18/tcp    Message Send Protocol
msp              18/udp    Message Send Protocol
#                          Rina Nethaniel <---none--->
chargen          19/tcp    Character Generator
chargen          19/udp    Character Generator
ftp-data         20/tcp    File Transfer [Default Data]
ftp-data         20/udp    File Transfer [Default Data]
#                          Jon Postel 
ftp-data         20/sctp   FTP
#                          IETF TSVWG
#                          Randall Stewart 
#                          [RFC4960]
ftp              21/tcp    File Transfer [Control]
ftp              21/udp    File Transfer [Control]
#                          Jon Postel 
ftp              21/sctp   FTP
#                          IETF TSVWG
#                          Randall Stewart 
#                          [RFC4960]
ssh              22/tcp    SSH Remote Login Protocol
ssh              22/udp    SSH Remote Login Protocol
#                          Tatu Ylonen 
ssh              22/sctp   SSH
#                          IETF TSVWG
#                          Randall Stewart 
#                          [RFC4960]
telnet           23/tcp    Telnet
telnet           23/udp    Telnet
#                          Jon Postel 
              24/tcp    any private mail system
              24/udp    any private mail system
#                          Rick Adams 
smtp             25/tcp    Simple Mail Transfer
smtp             25/udp    Simple Mail Transfer
#                          Jon Postel 
#                26/tcp    Unassigned
#                26/udp    Unassigned
nsw-fe           27/tcp    NSW User System FE
nsw-fe           27/udp    NSW User System FE
#                          Robert Thomas 
#                28/tcp    Unassigned
#                28/udp    Unassigned
msg-icp          29/tcp    MSG ICP
msg-icp          29/udp    MSG ICP
#                          Robert Thomas 
#                30/tcp    Unassigned
#                30/udp    Unassigned
msg-auth         31/tcp    MSG Authentication
msg-auth         31/udp    MSG Authentication
#                          Robert Thomas 
#                32/tcp    Unassigned
#                32/udp    Unassigned
dsp              33/tcp    Display Support Protocol
dsp              33/udp    Display Support Protocol
#                          Ed Cain 
#                34/tcp    Unassigned
#                34/udp    Unassigned
              35/tcp    any private printer server
              35/udp    any private printer server
#                          Jon Postel 
#                36/tcp    Unassigned
#                36/udp    Unassigned
time             37/tcp    Time
time             37/udp    Time
#                          Jon Postel 
rap              38/tcp    Route Access Protocol
rap              38/udp    Route Access Protocol
#                          Robert Ullmann

cite from http://www.iana.org/assignments/port-numbers