country code top level domain (TLD) (ccTLD)
Top level domains(TLDs) are divided into geographical or country code top level domains (ccTLDs) and organizational and generic top level domains(gTLDs).
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Country code top level domains are assigned to countries or geographical regions and consist of two letters. For example, the Top Level Domain *.de stands for Germany, *.fr for France, *.at for Austria and *.ca for Canada. The rules and guidelines for registering ccTLD domains vary relatively widely.