initially conversion to IP Address used table lookup
now distributed databases on DNS servers
multi part and hierarchical - right most part is TLD
RFC 819 ( 8 Feb 1982 ) Computer mail meeting notes
assigned 1st top level domain (TLD) - .ARPA
RFC 920 ( 1 Oct 1984 ) Domain requirements
added .GOV, .EDU, .COM, .MIL, .ORG
and 2 letter country code TLDs
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