Basic Socket Interface Extensions for IPv6

This specification has been revised 2 times since RFC 2133 (1997). Each document below formally obsoleted the one before it; the versions still in force are listed first.

Revision timeline

  1. RFC 2133 (1997)
  2. RFC 2553 (1999)
  3. RFC 3493 (2003)

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Superseded versions — historical reference only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 3493 (March 2003).