RFC 721: Out-of-Band Control Signals in a Host-to-Host Protocol

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Outgoing relationships (1 related RFC)

Informative reference — RFC 675: Specification of Internet Transmission Control Program

Incoming relationships (2 related RFCs)

Obsoleted by, Normatively referenced by — RFC 7805: Moving Outdated TCP Extensions and TCP-Related Documents to Historic or Informational Status
Normatively referenced by — RFC 7414: A Roadmap for Transmission Control Protocol (TCP) Specification Documents