RFC Status Reference Notes
2401 Obsolete S. Kent; R. Atkinson (November 1998), Security Architecture for the Internet Protocol, Network Working Group, doi:10.17487/RFC2401, RFC 2401, https://datatracker.ietf.org/doc/html/rfc2401  Obsoleted by RFC 4301. Obsoletes RFC 1825. Updated by RFC 3168.
2402 Obsolete S. Kent; R. Atkinson (November 1998), IP Authentication Header, Network Working Group, doi:10.17487/RFC2402, RFC 2402, https://datatracker.ietf.org/doc/html/rfc2402  Obsoleted by RFC 4303 and 4205. Obsoletes RFC 1826.
2406 Obsolete D. Harkins; R. Atkinson (November 1998), IP Encapsulating Security Payload (ESP), Network Working Group, doi:10.17487/RFC2406, RFC 2406, https://datatracker.ietf.org/doc/html/rfc2406  Obsoleted by RFC 4303, 4305. Obsoletes RFC 1827.
2409 Obsolete S. Kent; D. Carrel (November 1998), The Internet Key Exchange (IKE), Network Working Group, doi:10.17487/RFC2409, RFC 2409, https://datatracker.ietf.org/doc/html/rfc2409  Obsoleted by RFC 4306. Updated by RFC 4109.
2410 Proposed Standard R. Glenn; S. Kent (November 1998), The NULL Encryption Algorithm and Its Use With IPsec, Network Working Group, doi:10.17487/RFC2410, RFC 2410, https://datatracker.ietf.org/doc/html/rfc2410 
2453 Internet Standard G. Malkin (November 1998), RIP Version 2, Network Working Group, doi:10.17487/RFC2453, STD 53. RFC 2453, https://datatracker.ietf.org/doc/html/rfc2453  Obsoletes RFC 1723 and 1388. Updated by RFC 4822.
2460 Obsolete S. Deering; R. Hinden (December 1998), Internet Protocol, Version 6 (IPv6) Specification, Network Working Group, doi:10.17487/RFC2460, RFC 2460, https://datatracker.ietf.org/doc/html/rfc2460  Obsoleted by RFC 8200. Obsoletes RFC 1883. Updated by RFC 5095, 5722, 5871, 6437, 6564, 6935, 6946, 7045 and 7112.
2464 Proposed Standard সাঁচ:Cite ietf Obsoletes RFC 1972.
2468 Informational V. Cerf (October 17, 1998), I Remember IANA, Network Working Group, doi:10.17487/RFC2468, RFC 2468, https://datatracker.ietf.org/doc/html/rfc2468 
2469 Informational T. Narten; C. Burton (December 1998), A Caution On The Canonical Ordering Of Link-Layer Addresses, Network Working Group, doi:10.17487/RFC2469, RFC 2469, https://datatracker.ietf.org/doc/html/rfc2469 
2471 Obsolete R. Hinden; R. Fink; J. Postel (December 1998), IPv6 Testing Address Allocation, Network Working Grouop, doi:10.17487/RFC2471, RFC 2471, https://datatracker.ietf.org/doc/html/rfc2471  Obsoleted by RFC 3701. Obsoletes RFC 1897.
2473 Proposed Standard A. Conta; S. Deering (December 1998), Generic Packet Tunneling in IPv6 Specification, Network Working Group, doi:10.17487/RFC2473, RFC 2473, https://datatracker.ietf.org/doc/html/rfc2473 
2474 Proposed Standard K. Nichols; S. Blake; F. Baker; D. Black (December 1998), Definition of the Differentiated Services Field (DS Field) in the IPv4 and IPv6 Headers, Network Working Group, doi:10.17487/RFC2474, RFC 2474, https://datatracker.ietf.org/doc/html/rfc2474  Obsoletes RFC 1455 and 1349. Updated by RFC 3168, 3260 and 8436.