Question: What is the code of the area which was established in 1957 ?

text: ISO 3166-1 alpha-2
Current codes -- Reserved code elements
Exceptionally reserved code elements are codes reserved at the request of national ISO member bodies , governments and international organizations , which are required in order to support a particular application , as specified by the requesting body and limited to such use ; any further use of such code elements is subject to approval by the ISO 3166/MA . The following alpha-2 codes are currently exceptionally reserved :
ISO 3166-1 alpha-2 codes are two-letter country codes defined in ISO 3166-1, part of the ISO 3166 standard published by the International Organization for Standardization (ISO), to represent countries, dependent territories, and special areas of geographical interest. They are the most widely used of the country codes published by ISO (the others being alpha-3 and numeric), and are used most prominently for the Internet's country code top-level domains (with a few exceptions). They are also used as country identifiers extending the postal code when appropriate within the international postal system for paper mail, and has replaced the previous one consisting one-letter codes. They were first included as part of the ISO 3166 standard in its first edition in 1974.
Code Area name or country name Current actual country ccTLD Notes
AC Ascension Island United Kingdom .ac Reserved on request of UPU for stamp issuing area
CP Clipperton Island France - Reserved on request of ITU for location of certain telecommunications installations
DG Diego Garcia United Kingdom - Reserved on request of ITU for location of certain telecommunications installations
EA Ceuta , Melilla Spain - Reserved on request of WCO for area not covered by European Union Customs arrangements Part of Spanish North Africa ( Spanish : África Septentrional Española )
EU European Union multiple .eu Reserved on request of ISO 4217 /MA for the European monetary unit Euro Extended for ISO 6166 Securities - International securities identification numbering system ( ISIN ) in March 1998 Extended for any application needing to represent the name European Union in August 1999
EZ Eurozone multiple - Reserved on request of ISO 6166 /RA for the European OTC derivatives within International securities identification numbering system ( ISIN )
FX France , Metropolitan France - Reserved on request of France Officially assigned before deleted from ISO 3166-1 ( now assigned ISO 3166-3 code FXFR )
IC Canary Islands Spain - Reserved on request of WCO for area not covered by European Union Customs arrangements . Code taken from name in Spanish : Islas Canarias
SU USSR multiple .su From June 2008 ; Transitionally reserved from September 1992 Officially assigned before deleted from ISO 3166-1 ( now assigned ISO 3166-3 code SUHH ) Official name : Union of Soviet Socialist Republics ( common name : Soviet Union )
TA Tristan da Cunha United Kingdom - Reserved on request of UPU for stamp issuing area
UK United Kingdom United Kingdom .uk Reserved on request of the United Kingdom lest UK be used for any other country Also used by the European Commission United Kingdom is officially assigned the alpha-2 code GB
UN United Nations multiple - Reserved directly by ISO 3166 /MA for the United Nations