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Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
Notes ^ RC is Taiwan, VH is Hong Kong, VM is Macao Christmas Island (territory of Australia) ISO 3166-1 numeric 162 ISO 3166-1 alpha-3 CXR ISO 3166-1 alpha-2 CX ICAO airport code prefix YP E.164 code 61 IOC country code — Country code top-level domain.cx ICAO aircraft regis. prefix VH- E.212 mobile country code 505 NATO three-letter code CXR NATO two-letter code KT LOC MARC code XA ITU ...
The two-letter country codes were used by the US government for geographical data processing in many publications, such as the CIA World Factbook. The standard is also known as DAFIF 0413 ed 7 Amdt. No. 3 (Nov 2003) and as DIA 65-18 ( Defense Intelligence Agency , 1994, "Geopolitical Data Elements and Related Features").
There are generally two widely accepted versions of a postal code: a ZIP code and a ZIP + 4 code. Established in 1963, ZIP codes are the most common and recognizable postal code used by the USPS.
A country code is a short alphanumeric identification code for countries and dependent areas. Its primary use is in data processing and communications . Several identification systems have been developed.
A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country, sovereign state, or dependent territory identified with a country code. All ASCII ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs.
Worldwide distribution of country calling codes. Regions are coloured by first digit. Telephone country codes, but also sometimes referred to as country dial-in codes, or historically international subscriber dialing (ISD) codes in the U.K., are telephone number dialing prefixes for reaching subscribers in foreign countries or areas via international telecommunication networks.
CT scan or X-ray computed tomography, a medical imaging method; Calcitonin (symbol CT), a hormone produced in the thyroid gland; Calibrated automated thrombogram (CT or CAT), a coagulation test; Cardiothoracic surgery, the field of medicine specializing in chest surgery; Chemotype (ct.), a chemically distinct entity in a plant or microorganism