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A central part of [[IANA]]'s function is to establish baseline standards for eligible TLDs. These standards are largely unchanged since the inception of ICANN, and are based on Jon Postel's [[RFC 1591]].<ref>[https://www.iana.org/domains/root IANA.org - Root Zone Management]</ref> A central value of the Internet, and organizations dedicated to its maintenance, is the stability and security of the root zone; as a result, the policies and principles memorialized in RFC 1591 are largely followed today.<ref>See, for example, the Internet Society's [https://www.internetsociety.org/ianatimeline/ IANA Timeline], covering the development of the RFC in 1994, and the subsequent "New Registries and the Delegation of International Top Level Domains," drafted by Postel in 1996.</ref><ref name="rfc1591">[https://tools.ietf.org/html/rfc1591 IETF.org - RFC 1591]</ref><ref name="iana01">[https://tools.ietf.org/html/draft-postel-iana-itld-admin-01 IETF.org - IANA-ITLD-Admin-01]</ref>
A central part of [[IANA]]'s function is to establish baseline standards for eligible TLDs. These standards are largely unchanged since the inception of ICANN, and are based on Jon Postel's [[RFC 1591]].<ref>[https://www.iana.org/domains/root IANA.org - Root Zone Management]</ref> A central value of the Internet, and organizations dedicated to its maintenance, is the stability and security of the root zone; as a result, the policies and principles memorialized in RFC 1591 are largely followed today.<ref>See, for example, the Internet Society's [https://www.internetsociety.org/ianatimeline/ IANA Timeline], covering the development of the RFC in 1994, and the subsequent "New Registries and the Delegation of International Top Level Domains," drafted by Postel in 1996.</ref><ref name="rfc1591">[https://tools.ietf.org/html/rfc1591 IETF.org - RFC 1591]</ref><ref name="iana01">[https://tools.ietf.org/html/draft-postel-iana-itld-admin-01 IETF.org - IANA-ITLD-Admin-01]</ref>
IANA currently lists the following eligible categories of TLDs:<ref>[https://www.iana.org/help/eligible-tlds IANA.org - Eligible TLD strings]</ref>
*Approved [[Generic Top Level Domain|generic TLDs]];
*Two-letter country codes based on the [[ISO 3166-1]] alpha-two code ([[ccTLD|country code top level domains]]);
*[[IDN Fast Track]] approved strings;
*Strings eligible under under ICANN Board Resolution 00.74 (currently this category applies to only one domain, .eu);<ref>[https://features.icann.org/2000-09-25-delegation-cctlds ICANN - Board Resolution on the Delegation of ccTLDs]</ref>
*"Grandfathered" TLDs from prior to 2000, based on "exceptionally reserved" codes in the ISO 3166-1 standard (this category currently applies to two TLDs - .uk and .ac);
*Infrastructure domain (.ARPA); and
*Test domains, per ICANN Board Resolution 07.47 (eleven such domains have been delegated thus far)<ref>[https://www.icann.org/resources/board-material/resolutions-2007-06-29-en ICANN.org - Board Resolutions Adopted June 29, 2006]</ref>
==TLD Growth - Overview from 1983 to 2021==
==TLD Growth - Overview from 1983 to 2021==