RFC 503 (rfc503) - Page 1 of 8

Socket number list

Network Working Group                                          N. Neigus
Request for Comments: 503                                      J. Postel
NIC: 15747                                                 13 April 1973
References: 349, 433


                           Socket Number List

   This is a second pass at the specification of the socket numbers.
   More sockets have been made available for experimental functions,
   some new sockets have been assigned for network standard functions,
   host specific functions and experimental functions, and the list of
   available sockets for server hosts has been updated.

   Following are the current assignments for socket numbers used for
   public functions.  Note that a socket number is a 40 bit quantity,
   the first 8 bits being the host specification, the next 24 bits being
   site specific, and the last 8 bits being user specified -- these last
   8 bits are called the AEN [it stands for, cleverly enough, Another
   Eightbit Number].

   For the assignments here the value in the host field ranges across al
   hosts (unless otherwise specified), the value in the 24 bit field is
   zero, and the AEN is indicated here.

General Assignments:

   Sockets             Assignment

   0 - 63              Network Wide Standard Functions
   64 - 127            Host Specific Functions
   128 - 223           Reserved for Future Use
   224 - 255           Any Experimental Function


















Neigus, et. al.