Changes for RFC1638https://datatracker.ietf.org/doc/rfc1638/history/1994-06-09T07:00:00+00:00History of change entries for RFC1638.[(System)] Document has expired [rev. 04]1994-06-09T07:00:00+00:00(System)https://datatracker.ietf.org/doc/rfc1638/history/#history-18099Document has expired[(System)] RFC published [rev. 04]1994-06-01T07:00:00+00:00(System)https://datatracker.ietf.org/doc/rfc1638/history/#history-265441RFC published