| RFC | Status | Reference | Notes |
|---|---|---|---|
| 6429 | Obsolete | M. Bashyam; M. Jethanandani; A. Ramaiah (December 2011). TCP Sender Clarification for Persist Condition. IETF. doi:10.17487/RFC6429. ISSN 2070-1721. RFC 6429. | Obsoleted by RFC 9293. |
| 6437 | Proposed Standard | S. Amante; B. Carpenter; S. Jiang; J. Rajahalme (November 2011). IPv6 Flow Label Specification. IETF. doi:10.17487/RFC6437. ISSN 2070-1721. RFC 6437. | Obsoletes RFC 3697. Updates RFC 2205 and 2460. |
| 6441 | Best Common Practice | L. Vegoda (November 2011). Time to Remove Filters for Previously Unallocated IPv4 /8s. IETF. doi:10.17487/RFC6441. ISSN 2070-1721. BCP 171. RFC 6441. | |
| 6471 | Informational | C. Lewis; M. Sergeant (January 2012). Overview of Best Email DNS-Based List (DNSBL) Operational Practices. Internet Research Task Force (IRTF). doi:10.17487/RFC6471. ISSN 2070-1721. RFC 6471. |
