RFC 1

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RFC 1 (titled Host Software) is the very first Request for Comments of what would eventually become the Internet Engineering Task Force. It was published April 7, 1969 by Steve Crocker at the University of California Los Angeles. It documents the layer 1 Interface Message Processor protocol, used to connect computers on the ARPANET. Although written by Steve Crocker, the RFC emerged from an early working group discussion between Steve Crocker, Steve Carr, Jeff Rulifson. (The document lists Bill Duvall as having attended only the final working group meeting prior to publication.)

Unlike the modern RFCs, many of the early RFCs were requests for comments. The RFC leaves questions open and is written in a less formal style. This less formal style is now typical of Internet Draft documents, the precursor step before being approved as an RFC.

RFC 100 in 1971 lists RFC 1 as having been obsoleted.