| RFC | Status | Reference | Notes |
|---|---|---|---|
| 6013 | Obsolete | W. Simpson (January 2011). TCP Cookie Transactions (TCPCT). IETF. doi:10.17487/RFC6013. ISSN 2070-1721. RFC 6013. | Obsoleted by RFC 7805. |
| 6052 | Proposed Standard | C. Bao; C. Huitema; M. Bagnulo; M. Boucadair; X. Li (October 2010). IPv6 Addressing of IPv4/IPv6 Translators. IETF. doi:10.17487/RFC6052. ISSN 2070-1721. RFC 6052. | Updates RFC 4291. |
| 6068 | Proposed Standard | M. Duerst; L. Masinter; J. Zawinski (October 2010). The 'mailto' URI Scheme. IETF. doi:10.17487/RFC6068. ISSN 2070-1721. RFC 6068. | Obsoletes RFC 2368. |
| 6088 | Proposed Standard | G. Tsirtsis; G. Giaretta; H. Soliman; N. Montavont (January 2011). Traffic Selectors for Flow Bindings. IETF. doi:10.17487/RFC6088. ISSN 2070-1721. RFC 6088. | |
| 6093 | Obsolete | F. Gont; A. Yourtchenko (January 2011). On the Implementation of the TCP Urgent Mechanism. Internet Engineering Task Force. doi:10.17487/RFC6093. ISSN 2070-1721. RFC 6093. | Obsoleted by RFC 9293. Updates RFC 793, 1011, 1122. |
