ISO 3166-3

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ISO 3166-3 is an international standard that defines codes for outdated ISO 3166-1 country codes and is part of ISO 3166.

If after 1974, countries:

merged (e.g. East and West Germany)
split up (e.g. Czechoslovakia)
changed the main part of their name

the codes were withdrawn from ISO 3166-1 and with addition of two letters put in ISO 3166-3.

ISO 3166-3 uses four-character alphabetic codes. The first two characters are the withdrawn code from ISO 3166-1 alpha-2, while the last two characters are the ISO 3166-1 alpha-2 code that replaced it, the ISO 3166-1 alpha-2 code of the country that absorbed the country whose code is withdrawn, or the special code HH to indicate that there is no single successor code.

[edit] Current codes

The following list of obsolete ISO 3166 two-letter country codes is included here for reference. In the list, the old two-letter code is given first, followed by the ISO 3166-3 four-letter code, the year of withdrawal, the name of the territory, and any related notes.

Once five years have passed from the time of withdrawal, the two-letter code is free to be reassigned, as has been done with AI, CS, GE, and SK. However, some of the two-letter codes remain transitionally reserved for a longer period.

Many of these codes were withdrawn before the introduction of the domain name system, and so were never used as country code top-level domains (ccTLDs). However, some of them, namely SU, TP, and YU, are still used as ccTLDs.

Note that CS occurs twice in the table: the first time for the split of Czechoslovakia and the second time for the split of Serbia and Montenegro. CSHH was assigned to Serbia and Montenegro on 2006-09-26 [1]. To avoid confusion, however, the code CSHH is used for Czechoslovakia, while the code CSXX is used for Serbia and Montenegro since 2006-12-01. [2]

`AI`	`AIDJ`	1977	French Territory of the Afars and the Issas	Changed its name to Djibouti `DJ` `AI` has been reassigned to Anguilla
`BQ`	`BQAQ`	1979	British Antarctic Territory	Merged to form part of Antarctica `AQ`
`BU`	`BUMM`	1989	Burma	Changed its name to Myanmar `MM` `BU` is currently transitionally reserved
`CS`	`CSHH`	1993	Czechoslovakia	Split up into Czech Republic `CZ` and Slovakia `SK` `CS` has been reassigned to Serbia and Montenegro until its split in 2006
`CS`	`CSXX`	2006	Serbia and Montenegro	Split up into Montenegro `ME` and Serbia `RS` `CS` is currently transitionally reserved
`CT`	`CTKI`	1984	Canton and Enderbury Islands	Merged to form part of Kiribati `KI`
`DD`	`DDDE`	1990	German Democratic Republic	Merged to form part of Germany `DE`
`DY`	`DYBJ`	1977	Dahomey	Changed its name to Benin `BJ`
`FQ`	`FQHH`	1979	French Southern and Antarctic Territories	Split up into Adélie Land, which merged to form part of Antarctica `AQ`, and French Southern Territories `TF`
`FX`	`FXFR`	1997	Metropolitan France	Merged to form part of France `FR`
`GE`	`GEHH`	1979	Gilbert and Ellice Islands	Split up into Kiribati `KI` and Tuvalu `TV` `GE` has been reassigned to Georgia
`HV`	`HVBF`	1984	Upper Volta	Changed its name to Burkina Faso `BF`
`JT`	`JTUM`	1986	Johnston Island	Merged to form part of United States Minor Outlying Islands `UM`
`MI`	`MIUM`	1986	Midway Islands	Merged to form part of United States Minor Outlying Islands `UM`
`NH`	`NHVU`	1980	New Hebrides	Changed its name to Vanuatu `VU`
`NQ`	`NQAQ`	1983	Dronning Maud Land	Merged to form part of Antarctica `AQ`
`NT`	`NTHH`	1993	Neutral Zone	Split up into two parts, which merged to form parts of Iraq `IQ` and Saudi Arabia `SA` respectively `NT` is currently transitionally reserved
`PC`	`PCHH`	1986	Trust Territory of the Pacific Islands	Split up into Federated States of Micronesia `FM`, Marshall Islands `MH`, Northern Mariana Islands `MP`, and Palau `PW`
`PU`	`PUUM`	1986	U.S. Miscellaneous Pacific Islands	Consisting of Baker Island, Howland Island, Jarvis Island, Kingman Reef, and Palmyra Atoll Merged to form part of United States Minor Outlying Islands `UM`
`PZ`	`PZPA`	1980	Panama Canal Zone	Merged to form part of Panama `PA`
`RH`	`RHZW`	1980	Rhodesia	Changed its name to Zimbabwe `ZW`
`SK`	`SKIN`	1975	Sikkim	Merged to form part of India `IN` `SK` has been reassigned to Slovakia
`SU`	`SUHH`	1992	U.S.S.R.	Split up into Armenia `AM`, Azerbaijan `AZ`, Belarus `BY`, Estonia `EE`, Georgia `GE`, Kazakhstan `KZ`, Kyrgyzstan `KG`, Latvia `LV`, Lithuania `LT`, Republic of Moldova `MD`, Russian Federation `RU`, Tajikistan `TJ`, Turkmenistan `TM`, Ukraine `UA`, and Uzbekistan `UZ`, of which `BY` and `UA` had already existed `SU` is currently transitionally reserved, and still used as a ccTLD
`TP`	`TPTL`	2002	East Timor	Changed its code to `TL` `TP` is currently transitionally reserved, and still used as a ccTLD
`VD`	`VDVN`	1977	Democratic Republic of Viet-Nam	Merged to form part of Viet Nam `VN`
`WK`	`WKUM`	1986	Wake Island	Merged to form part of United States Minor Outlying Islands `UM`
`YD`	`YDYE`	1990	Democratic Yemen	Merged to form part of Yemen `YE`
`YU`	`YUCS`	2003	Yugoslavia	Represented Socialist Federal Republic of Yugoslavia until 1991 and Federal Republic of Yugoslavia from 1992 to 2003 Changed its name to Serbia and Montenegro `CS` `YU` is currently transitionally reserved, and still used as a ccTLD
`ZR`	`ZRCD`	1997	Zaire	Changed its name to Democratic Republic of the Congo `CD` `ZR` is currently transitionally reserved