In 1994, Postel released RFC 1591 which explained the entire structure of the DNS and specified the original TLDs (.com, .edu, .gov .mil, .net, .org and .int) are categorized as generic top level domains (gTLDs) and the two-letter country codes from ISO-3166 list. It was mentioned in the [[RFC]] that introduction of new TLDs will be unlikely.<ref>[http://tools.ietf.org/html/rfc1591 RFC 1591]</ref>
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In 1994, Postel released RFC 1591 which explained the entire structure of the DNS and specified that the original TLDs (.com, .edu, .gov .mil, .net, .org and .int) are categorized as generic top level domains (gTLDs) and the two-letter country codes from ISO-3166 list. It was mentioned in the [[RFC]] that introduction of new TLDs will be unlikely.<ref>[http://tools.ietf.org/html/rfc1591 RFC 1591]</ref>