Public index · Computing
RFC 42
RFC 42
Recorded
RFC 42 · Message Data Types. E. I. Ancona, 31 March 1970.
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The forty-second Request for Comments. It asks that the first eight bits of an ARPANET message name the type of the rest. Sequential numbering. The content is about how a message says what it is.
What it supports
RFC 42, E. I. Ancona, MIT Lincoln Laboratory, 31 March 1970. Title: Message Data Types. rfc-editor. org/rfc/rfc42. txt. 42 is the series number.
What it does not
Not IANA port 42. Not INTERNET the English word. 41 and 43 are also RFCs. Catalogue seat, not an Answer.
ExactnessDesignation
Form42
Unitcatalogue
Strengthhard
Hung16 September 2026