RFC Status Reference Notes
3701 Informational R. Fink; R. Hinden (March 2004). 6bone (IPv6 Testing Address Allocation) Phaseout. Network Working Group. RFC 3701. https://tools.ietf.org/html/rfc3701.  Obsoletes RFC 2471.
3704 Best Common Practice F. Baker; P. Savola (March 2004). Ingress Filtering for Multihomed Networks. IETF. BCP 84. RFC 3704. https://tools.ietf.org/html/rfc3704.  Updated by RFC 8704. Updates RFC 2827.
3751 Informational S. Bradner (1 April 2004). Omniscience Protocol Requirements. Network Working Group. RFC 3751. https://tools.ietf.org/html/rfc3751.  This is an April Fools' Day Request for Comments.