"At the end of every URL and email address is a top-level domain (TLD). Although .com is the world’s most popular TLD, it is far from alone. There are more than 260 TLDs in use around the world, most of which are country code top-level domains (ccTLDs).
The Country Codes of the World map includes 245 country codes, which encompasses all United Nations countries as well as numerous islands and territories. Each two-digit code is aligned over the country it represents and is color coded with the legend below for quick and easy reference."