Internet top-level domain
Country code TLDs
As of 20.08.2017 ISO list contains 249 officially assigned codes.
As of 9.09.2015 ICANN's IANA Root Zone Database contains 255 two-latin-letters country-code domains, including 249 ISO-assigned codes + AC (Ascension - while it is part of Saint Helena, Ascension and Tristan da Cunha territory in SH ISO code), AN (former Netherlands Antilles, divided into BQ, CW and SX), EU (European Union), SU (Soviet Union), TP (former Portuguese Timor) and UK (United Kingdom, along with GB for Great Britain - domain GB is Reserved and works for only one 2nd-level domain name hmg.gb - stands for 'Her Majesty Government' - with several subdomains but no websites on them).
247 domains are online. Domains BL (Saint Barthélemy), BQ (Bonaire, Sint Eustatius and Saba), EH (Western Sahara), MF (Saint Martin), SS (South Sudan) and UM (U.S. Minor Outlying Islands) are marked as Not assigned. AN and TP marked as Retired.
12 ISO codes are exceptionally reserved at requests of countries and organisations:
AC Ascension Island CP Clipperton Island DG Diego Garcia EA Ceuta and Melilla EU European Union EZ (European OTC derivatives) FX France, Metropolitan IC Canary Islands SU USSR TA Tristan da Cunha UK United Kingdom UN United Nations
Reserved codes AC, EU, SU and UK are delegated as Internet TLDs.
7 ISO codes are transitionally reserved for 50 years after renaming of countries or dissolution of federations and dependent territories:
BU Burma Reserved from 1989-12 to 2039-12. New country name: Myanmar MM NT Neutral Zone Reserved from 1993-07 to 2043-07. Divided between Iraq and Saudi Arabia IQ+SA ZR Zaire Reserved from 1997-07 to 2047-07. New country name: Congo (Kinshasa) CD TP East Timor Reserved from 2002-05 to 2052-05. New country name: Timor-Leste TL YU Yugoslavia Reserved from 2003-07 to 2053-07. New country name: Serbia and Montenegro CS CS Serbia and Montenegro Reserved from 2006-09 to 2056-09. Divided to Serbia and Montenegro RS+ME AN Netherlands Antilles Reserved from 2010-12 to 2060-12. Divided (see below) BQ+CW+SX
.AN deleted by ISO on 2010-12-15/2011-12-13 - and is still transitionally reserved to Netherlands Antilles (divided into: Bonaire, Sint Eustatius and Saba - BQ, Curaçao - CW and Sint Maarten - SX).