This is a list of country calling codes defined by ITU-T recommendations E.123 and E.164, also called IDD (International Direct Dialling) or ISD (International Subscriber Dialling) codes.
The telephone numbering plan for a telephone system includes an international dialing prefix, such as "00" or "011", which is added before the country calling code and is specific to the country from which the caller is dialling. Generally, as in the list below, the need for this prefix is specified with a "+".
- Zone 1 – North American Numbering Plan Area
- Zone 2 – Mostly Africa
- Zones 3/4 – Europe
- Zone 5 – Mostly Latin America
- Zone 6 – Southeast Asia and Oceania
- Zone 7 – Eurasia (former Soviet Union)
- Zone 8 – East Asia and Special Services
- Zone 9 – Central, South and Western Asia
- Locations with no country code
In Antarctica dialing is dependent on the parent country of each base:
World Time
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