A country code top-level domain (ccTLD) is an Internet top-level domain generally used or reserved for a country or a dependent territory.
ccTLD identifiers are two letters long, and all two-letter top-level domains are ccTLDs. Creation and delegation of ccTLDs is performed by the Internet Assigned Numbers Authority (IANA), and with certain exceptions noted below corresponds to the ISO 3166-1 alpha-2 country codes maintained by the United Nations.
A domain hack is an unconventional domain name that combines domain labels, especially the top-level domain (TLD), to spell out the full "name" or title of the domain, making a kind of pun.
For example the second-level domain (SLD) blo.gs makes use of the TLD .gs (South Georgia and the South Sandwich Islands) to spell "blogs". The third-level domains del.icio.us and cr.yp.to make use of the SLDs icio.us and yp.to from the TLDs .us (United States) and .to (Tonga) to spell "delicious" and "crypto" respectively.
Pocket Internet Explorer displaying the Wikipedia main page on a PDA
Opera Mini displaying the Wikipedia portal
Domain names, arranged in a tree, cut into zones, each served by a nameserver.
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