standard The RFC STD 2 documenting the currently

assigned values from several series of numbers used in network

protocol implementations. This RFC is updated periodically

and, in any case, current information can be obtained from the

Internet Assigned Numbers Authority (IANA). If you are

developing a protocol or application that will require the use

of a link, socket, port, protocol, etc., you should

contact the IANA to receive a number assignment.