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| RFC 7042 | |
|---|---|
| Title | RFC 7042 |
| Status | Informational |
| Authors | Unknown |
| Published | December 2013 |
| Category | IETF Informational |
RFC 7042
RFC 7042 is an informational memorandum from the Internet Engineering Task Force that lists "IANA Reserved IPv4 Prefixes" and provides background on special-use network identifiers. It summarizes registry practices and clarifies handling for addresses and prefixes referenced in Internet protocols. The document complements other IETF publications and registry procedures by cataloging reserved network identifiers for practical operational use.
RFC 7042 provides an enumerated compilation that complements documents such as Request for Comments and registry guidance from Internet Assigned Numbers Authority, linking operational practice with standards work by groups like the Internet Engineering Task Force and Internet Architecture Board. It situates reserved prefixes alongside historical documents developed within forums such as the National Institute of Standards and Technology liaison discussions and working groups including IETF Working Group efforts. The memorandum informs implementers who reference technical material produced by bodies such as World Wide Web Consortium, Institute of Electrical and Electronics Engineers, International Telecommunication Union, and European Telecommunications Standards Institute.
The purpose of the memorandum is to clarify use of special-purpose IPv4 prefixes that have origins in operational needs debated in venues like ARPA, Defense Advanced Research Projects Agency, and task forces influenced by events such as the deployment timelines associated with IPv6 transition activities. Its background references stewardship by organizations including Internet Society, Regional Internet Registry, American Registry for Internet Numbers, RIPE NCC, and Asia-Pacific Network Information Centre, reflecting coordination seen in multistakeholder environments like United Nations forums and technical policy debates that involve entities such as Federal Communications Commission and European Commission. The document assists implementers from projects hosted at institutions such as MIT, Stanford University, Harvard University, University of California, Berkeley, and research laboratories like Los Alamos National Laboratory.
The document is concise and organized to enumerate prefixes alongside succinct annotations, following the organizational patterns used in prior work such as RFC 1918, RFC 3330, and later clarifications similar to those in RFC 6890 and RFC 5735. Its contents mirror registry representations maintained by bodies like IANA Registry, ARIN, LACNIC, AfriNIC, and APNIC, and are structured to be compatible with tooling developed by projects originating from groups such as NetBSD Foundation, FreeBSD Project, OpenBSD Project, Linux Foundation, and vendors including Cisco Systems and Juniper Networks. The memo lists entries that relate operationally to historic practices discussed at conferences such as Interop, RIPE Meetings, and workshops convened by IETF Meetings and ICANN sessions.
Definitions in the memorandum align with terminology used by standards bodies and registries like IETF, IANA, IEEE, IAB, and IETF Working Group outputs; parallel vocabularies appear in documents produced by National Institute of Standards and Technology and export controls coordinated with agencies like U.S. Department of Commerce. Terms frequently encountered in implementations by vendors such as Microsoft, Apple Inc., Google, Amazon (company), and Facebook are reflected in software stacks maintained by communities around Apache Software Foundation, Mozilla Foundation, and Eclipse Foundation. The memo's succinct definitions help reconcile how operating systems from Microsoft Windows, macOS, and distributions like Ubuntu (operating system), Red Hat Enterprise Linux, and Debian treat reserved prefixes in logging, diagnostics, and configuration utilities.
System and network vendors, research groups, and service providers reference the list when implementing behavior in routers and hosts produced by companies like Cisco Systems, Huawei, Arista Networks, Fortinet, and Hewlett Packard Enterprise. Network operators participating in exchanges such as DE-CIX, LINX, AMS-IX, and providers including Level 3 Communications, NTT Communications, Verizon Communications, and AT&T apply these reserved designations during deployment, address planning, and incident response. The guidance informs software libraries used in projects by Google, Netflix, Cloudflare, and Amazon Web Services and is pertinent to testing and interoperability activities run by consortia like ETSI and research initiatives at CERN and European Organization for Nuclear Research.
RFC 7042 has been cited in operational guidance, network operator forums such as NANOG, academic curricula at institutions including Massachusetts Institute of Technology, Princeton University, University of Oxford, and in vendor documentation from Cisco Systems and Juniper Networks. Its impact is reflected in tooling and measurement platforms developed by organizations like RIPE NCC, ARIN, Team Cymru, CAIDA, and research outputs at MIT Lincoln Laboratory and Lawrence Berkeley National Laboratory. The memo contributes to the ecosystem of address stewardship and has been discussed in panels at events such as IETF Meetings, RIPE Meetings, and industry conferences like Black Hat and RSA Conference.
Category:Internet standards