RFC Status Reference Notes
6919 Experimental R. Barnes; S. Kent; E. Rescorla (1 April 2013). Further Key Words for Use in RFCs to Indicate Requirement Levels. Independent Submission. ISSN 2070-1721. RFC 6919. https://tools.ietf.org/html/rfc6919.  This is an April Fools' Day Request for Comments.
6921 Informational R. Hinden (1 April 2013). Design Considerations for Faster-Than-Light (FTL) Communication. Independent Submission. ISSN 2070-1721. RFC 6921. https://tools.ietf.org/html/rfc6921.  This is an April Fools' Day Request for Comments.
6951 Proposed Standard M. Tuexen; R. Stewart (May 2013). UDP Encapsulation of Stream Control Transmission Protocol (SCTP) Packets for End-Host to End-Host Communication. IETF. ISSN 2070-1721. RFC 6951. https://tools.ietf.org/html/rfc6951.  Updated by RFC 8899.
6980 Proposed Standard F. Gont (August 2013). Security Implications of IPv6 Fragmentation with IPv6 Neighbor Discovery. IETF. ISSN 2070-1721. RFC 6980. https://tools.ietf.org/html/rfc6980.  Updates RFC 3971 and 4861.
6996 Best Common Practice J. Mitchell (July 2013). Autonomous System (AS) Reservation for Private Use. IETF. ISSN 2070-1721. BCP 6. RFC 6996. https://tools.ietf.org/html/rfc6996.  Updates RFC 1930.