]> Internet Assigned Numbers Authority

PTI/ICANN 12025 Waterfront Drive Los Angeles CA 90094 United States of America kim.davies@iana.org

Internet Assigned Numbers Authority

PTI/ICANN 12025 Waterfront Drive Los Angeles CA 90094 United States of America amanda.baber@iana.org

This document deprecates the use of any "int" domain names that were designated for infrastructure purposes by the IETF, and it identifies them for removal from the "int" top-level domain. Any implementations that involve these domains are now deprecated. This document also changes the status of RFC 1528 and RFC 1706 to Historic.

Introduction The "int" top-level domain is a specialized domain designated for intergovernmental organizations, which are organizations established by international treaties between or among national governments. Historically, the "int" domain was also used for purposes related to Internet infrastructure. This practice ended in 2001 when the "arpa" domain was declared the appropriate home for infrastructural identifier spaces . In conjunction with this change, the eligibility for "int" domains was limited to only intergovernmental treaty organizations. The documented uses of infrastructural identifiers in the "int" domain were largely experimental and are now, in practice, obsolete. This document changes the status of related specifications to Historic, and it removes any associated delegations from the "int" zone in the domain name system.

Historical Infrastructural Uses The following domains were used for infrastructural identifier purposes that are now considered historic. Although each of these names was either delegated or documented at one time, the parties administering them have long since stopped using them.

atma.int The atma.int domain was experimentally defined to implement address lookups for Asynchronous Transfer Mode (ATM), including ATM End System Addresses (AESAs) .

ip4.int The ip4.int domain was described as providing an alternative to the in-addr.arpa domain for mapping host IPv4 addresses to host names. The in-addr.arpa domain zone continues to be administered for this purpose .

ip6.int The ip6.int domain was originally delegated for mapping host IPv6 addresses to host names. It was subsequently removed from the "int" zone, having been replaced by ip6.arpa .

nsap.int The nsap.int domain name was specified to experimentally map Open Systems Interconnection (OSI) Network Service Access Points to domain names .

rdi.int The rdi.int domain name experimentally mapped OSI Inter-Domain Routing Protocol's Routing Domain Identifiers to the domain name system.

reg.int The reg.int domain name hosted an experimental mechanism for publishing IANA registration values in the domain name system.

tpc.int The tpc.int domain name hosted an experimental remote printing service that served as a gateway between Internet mail and facsimile transmission .

Updates to Other RFC Series Documents

RFC 1528 The specification for tpc.int is Historic, as it no longer functions as described in the document.

RFC 1706 The specification for nsap.int is Historic, as it no longer functions as described in the document.

IANA Considerations IANA has removed the historical "int" domains discussed in this document.

Security Considerations Some old systems might have one or more subdomains of these names hardwired and expect a positive response for at least the second-level domain. This is, of course, true for any name in the DNS and should not be the sole basis for retaining obsolete names. Existing applications should eliminate any reliance upon these zones. The operator of the "int" domain should be cautious about any potential re-use of these domains for intergovernmental treaty organizations.

Additional Information This document is the result of a comprehensive inventory of .int domains to accurately establish and record their purpose based on historical documentation. As part of this inventory, IANA studied the domains delegated for purposes related to infrastructure identifiers. Query patterns in the DNS for these domains were analyzed and judged to be insignificant; preliminary outreach to the contacts for the associated domains was conducted. The assessment concluded that these domains are very likely obsolete. This document formalizes that assessment. There are a small number of nominal "int" domains for "international databases" that are not defined by any standards documentation. They are assigned to entities rather than for identifier purposes. Their dispositions are beyond the scope of this memo.

Informative References ISO/IEC The ATM Forum Technical Committee

Acknowledgments This document was compiled with help from Ted Hardie and Michelle Cotton, with additional input from Jari Arkko, John Klensin, Warren Kumari, Pete Resnick, George Michaelson, and Toerless Eckert.