RFC Editor Model (Version 3)

This specification has been revised 6 times since RFC 5620 (2009). Each document below formally obsoleted the one before it; the versions still in force are listed first.

Revision timeline

  1. RFC 5620 (2009)
  2. RFC 6548 (2012)
  3. RFC 6635 (2012)
  4. RFC 8728 (2020)
  5. RFC 8730 (2020)
  6. RFC 9280 (2022)
  7. RFC 9920 (2026)

Current versions — implement against these

Superseded versions — historical reference only

This lineage is derived automatically from the “obsoletes” relationships recorded in the public RFC Editor index — no editorial judgement is applied to the ordering. The most recent document in the chain is RFC 9920 (February 2026).