IANA

The global coordination of the DNS Root, IP addressing, and other Internet protocol resources is performed as the Internet Assigned Numbers Authority (IANA) functions.

Key Info

IANA is responsible for coordinating some of the key elements that keep the Internet running smoothly. While the Internet is renowned for being a worldwide network free from central coordination, there is a technical need for some key parts of the Internet to be globally coordinated, and this coordination role is undertaken by IANA.

Specifically, IANA allocates and maintains unique codes and numbering systems that are used in the technical standards (“protocols”) that drive the Internet.

IANA activities can be broadly grouped in to three categories:

  • Domain Names
    Management of the DNS Root, the .int and .arpa domains, and an IDN practices resource.

  • Number Resources
    Co-ordination of the global pool of IP and AS numbers, primarily providing them to Regional Internet Registries.

  • Protocol Assignments
    Internet protocols’ numbering systems are managed in conjunction with standards bodies.

IANA Protocol Parameter Assignments

The first choice below connects directly to IANA's web page. The second connects to the list of IANA Protocol Assignments maintained by the IETF Secretariat. Be advised that there is a brief time period when the two directories will be out of sync. When in doubt, the IANA webpage is the authoritative source page. 

Lists of IANA Protocol Assignments 

IANA Time Zone Database

The first choice below connects to the copy of the IANA Time Zone Database maintained by the IETF Secretariat. The second choice connects directly to IANA's web page. Be advised that there is a brief time period when the two directories will be out of sync. When in doubt, the IANA webpage is the authoritative source page. 

Contacting IANA