Request for Comments (RFC) Editor Homepage - The RFC Editor collates Request For Comments documents. This site explains the RFC process, and includes a searchable database of RFCs.
IETF Internet Drafts - List of documents organized by alphabetized subjects.
Active IETF Working Groups - A directory of the Internet Engineering Task Force groups and their web pages.
Internet protocols - General comments on protocol design, and good reference material on a few protocols (especially mail-related; also ftp, time, and misc) by Dan Bernstein.
Port Numbers and Services Database - Well known port numbers for TCP and UDP, from from Internet Assigned Numbers Authority (IANA).
RFC Sourcebook - Description of protocols, file formats, glossary of terms, RFCs.
TCP/UDP Port Numbers - A table of well known and not so well known protocol port assignments.
Internet Encyclopedia - Overview of Internet protocols.
Session Initiation Protocol (SIP) - Protocol for establishing multimedia sessions and Internet telephone calls. FAQs, background materials, lists of current work.
The Kermit Project - A protocol that transfers text and binary files without errors between diverse types of computers over potentially hostile communication links, and a suite of communications software programs; Columbia University.
Languages of the Internet - Description of Internet protocols with diagrams of data structures.
