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ISO 3166-3 is an international standard that defines codes for outdated ISO 3166-1 country codes and is part of ISO 3166.
- 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the codes were withdrawn from ISO 3166-1 and with addition of two letters put in ISO 3166-3.
ISO 3166-3 is four-digit-alphabetic and starts with the code that was withdrawn from ISO 3166-1.
Obsolete ISO 3166-1 alpha-2 codes
The following is a list of obsolete ISO 3166 two-letter country codes, included here for reference. Note that many of these codes were withdrawn before the introduction of the Domain Name System, and so were never used as top-level domains. In the following list, the old two-letter code is given first, followed by the ISO 3166-3 four-letter code. For each code, the year of withdrawal is given. Once five years have passed from the time of withdrawal the code is free to be reallocated, as has been done with AI, CS, GE and SK.
| AI | AIDJ | 1977 | French Territory of the Afars and the Issas | Replaced by DJ (for Djibouti). Note that AI has since been reassigned to Anguilla. |
|---|---|---|---|---|
| BQ | BQAQ | 1979 | British Antarctic Territory | Now covered by AQ (Antarctica). |
| BU | BUMM | 1989 | Burma | Replaced by MM (for Myanmar). |
| CS | CSHH | 1993 | Czechoslovakia | Replaced by CZ and SK. Note that CS is now assigned to Serbia and Montenegro (Srbija i Crna Gora). |
| CT | CTKI | 1984 | Canton and Enderbury Islands | Now covered by KI (Kiribati). |
| DD | DDDE | 1990 | East Germany | Now covered by DE (Germany). |
| DY | DYBJ | 1977 | Dahomey | Replaced by BJ (for Benin). |
| FQ | FQHH | 1979 | French Southern and Antarctic Territories | Now covered by AQ and TF. |
| FX | FXFR | 1997 | Metropolitan France | Covered by FR (France). |
| GE | GEHH | 1979 | Gilbert and Ellis Islands | Now covered by KI (Kiribati) and TV (Tuvalu). Note that GE has since been reassigned to Georgia. |
| HV | HVBF | 1984 | Upper Volta (Haute-Volta) | Replaced by BF (for Burkina Faso). |
| JT | JTUM | 1986 | Johnston Island | Now covered by UM. |
| MI | MIUM | 1986 | Midway Atoll | Now covered by UM. |
| NH | NHVU | 1980 | New Hebrides | Replaced by VU (for Vanuatu). |
| NQ | NQAQ | 1983 | Queen Maud Land | Now covered by AQ (Antarctica). |
| NT | NTHH | 1993 | Neutral Zone | Between Saudi Arabia (SA) and Iraq (IQ). |
| PC | PCHH | 1986 | Trust Territory of the Pacific Islands | Replaced by FM, MH, MP and PW. |
| PU | PUUM | 1986 | U.S. Miscellaneous Pacific Islands | Now covered by UM. |
| PZ | PZPA | 1980 | Panama Canal Zone | Now covered by PA (Panama). |
| RH | RHZW | 1980 | Rhodesia | Replaced by ZW (for Zimbabwe). |
| SK | SKIN | 1975 | Sikkim | Now covered by IN (India). Note that SK has since been reassigned to Slovakia. |
| SU | SUHH | 1992 | Soviet Union | Replaced by AM, AZ, BY, EE, GE, KG, KZ, LT, LV, MD, RU, TJ, TM, UA and UZ (of which BY and UA already existed). SU is still in use as a top-level domain. |
| TP | TPTL | 2002 | East Timor | Replaced by TL on becoming the independent country of Timor-Leste. TP is still in use as a top-level domain. |
| VD | VDVN | 1977 | Democratic Republic of Vietnam | Now covered by VN (Viet Nam). |
| WK | WKUM | 1986 | Wake Island | Now covered by UM. |
| YD | YDYE | 1990 | South Yemen | Now covered by YE (Yemen). |
| YU | YUCS | 2003 | Yugoslavia | Replaced by CS (for Serbia and Montenegro; Srbija i Crna Gora). YU is still in use as a top-level domain. |
| ZR | ZRCD | 1997 | Zaire | Replaced by CD (for Democratic Republic of the Congo). |