I typed it in from the front inside cover of my Stevens book (TCP/IP Illustrated Volume 1).

Wikipedia has it too: http://en.wikipedia.org/wiki/IPv4, but the real gospel is RFC791: http://www.ietf.org/rfc/rfc791.txt.

Update: Other protocol standards you might like:
RFC 768 User Datagram Protocol
RFC 792 Internet Control Message Protocol
RFC 793 Transmission Control Protocol

In reply to Re^3: Need help with (un)pack templates by gmargo
in thread Need help with (un)pack templates by Subop

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