RFC 4727: Experimental Values In IPv4, IPv6, ICMPv4, ICMPv6, UDP, and TCP Headers

When experimenting with or extending protocols, it is often necessary to use some sort of protocol number or constant in order to actually test or experiment…

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Incoming relationships (22 related RFCs)

Normatively referenced by — RFC 6335: Internet Assigned Numbers Authority (IANA) Procedures for the Management of the Service Name and Transport Protocol Port Number Registry
Normatively referenced by — RFC 7414: A Roadmap for Transmission Control Protocol (TCP) Specification Documents
Normatively referenced by — RFC 6745: ICMP Locator Update Message for the Identifier-Locator Network Protocol for IPv4 (ILNPv4)
Normatively referenced by — RFC 6746: IPv4 Options for the Identifier-Locator Network Protocol (ILNP)
Normatively referenced by — RFC 6994: Shared Use of Experimental TCP Options
Normatively referenced by — RFC 7605: Recommendations on Using Assigned Transport Port Numbers
Normatively referenced by — RFC 4775: Procedures for Protocol Extensions and Variations
Normatively referenced by — RFC 7126: Recommendations on Filtering of IPv4 Packets Containing IPv4 Options
Normatively referenced by — RFC 9288: Recommendations on the Filtering of IPv6 Packets Containing IPv6 Extension Headers at Transit Routers
Normatively referenced by — RFC 5726: Mobile IPv6 Location Privacy Solutions
Normatively referenced by — RFC 7974: An Experimental TCP Option for Host Identification
Informatively referenced by — RFC 5226: Guidelines for Writing an IANA Considerations Section in RFCs
Informatively referenced by — RFC 8126: Guidelines for Writing an IANA Considerations Section in RFCs
Informatively referenced by — RFC 9293: Transmission Control Protocol (TCP)
Informatively referenced by — RFC 6709: Design Considerations for Protocol Extensions
Informatively referenced by — RFC 5320: The Subnetwork Encapsulation and Adaptation Layer (SEAL)
Informatively referenced by — RFC 5350: IANA Considerations for the IPv4 and IPv6 Router Alert Options
Informatively referenced by — RFC 6013: TCP Cookie Transactions (TCPCT)
Informatively referenced by — RFC 5237: IANA Allocation Guidelines for the Protocol Field
Informatively referenced by — RFC 5096: Mobile IPv6 Experimental Messages
Informatively referenced by — RFC 5058: Explicit Multicast (Xcast) Concepts and Options
Informatively referenced by — RFC 6593: Service Undiscovery Using Hide-and-Go-Seek for the Domain Pseudonym System (DPS)