| RFC | Status | Reference | Notes |
|---|---|---|---|
| 4422 | Proposed Standard | A. Melnikov; K. Zeilenga, eds. (June 2006). Simple Authentication and Security Layer (SASL). Network Working Group. doi:10.17487/RFC4422. RFC 4422. | Obsoletes RFC 2222. |
| 4443 | Internet Standard | A. Conta; S. Deering (March 2006). M. Gupta (ed.). Internet Control Message Protocol (ICMPv6) for the Internet Protocol Version 6 (IPv6) Specification. Network Working Group. doi:10.17487/RFC4443. STD 89. RFC 4443. | Obsoletes RFC 2463. Updates RFC 2780. Updated by RFC 4884. |
| 4489 | Proposed Standard | J-S. Park; M-K. Shin; H-J. Kim (April 2006). A Method for Generating Link-Scoped IPv6 Multicast Addresses. Network Working Group. doi:10.17487/RFC4489. RFC 4489. | Updates RFC 3306. |
