obsoleted by

• rfc-9293 — Transmission Control Protocol (TCP)

obsoletes

• rfc-761 — DoD standard Transmission Control Protocol

updated by

• rfc-1122 — Requirements for Internet Hosts - Communication Layers
• rfc-3168 — The Addition of Explicit Congestion Notification (ECN) to IP
• rfc-6093 — On the Implementation of the TCP Urgent Mechanism
• rfc-6528 — Defending against Sequence Number Attacks