top-level domainA 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.
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Domain names, arranged in a tree, cut into zones, each served by a nameserver.