Retiring the Tao of the IETF

This specification has been revised 6 times since RFC 1391 (1993). Each document below formally obsoleted the one before it; the versions still in force are listed first.

Revision timeline

  1. RFC 1391 (1993)
  2. RFC 1539 (1993)
  3. RFC 1718 (1994)
  4. RFC 3160 (2001)
  5. RFC 4677 (2006)
  6. RFC 6722 (2012)
  7. RFC 9592 (2024)

Current version — implement against this

Superseded versions — historical reference only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 9592 (June 2024).