Thin WHOIS
A WHOIS system that provides only basic registrar information, requiring additional queries to the registrar for full contact details. Many registries now use thin WHOIS for privacy.
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Legacy TLD
The original group of top-level domains including .com, .net, .org, .edu, .gov, and .mil.
CIRA (Canadian Internet Registration Authority)
The organization that manages the .ca country code top-level domain for Canada.
.BIZ
A generic extension launched in 2001 as a .com alternative for businesses. It never earned the respect, and the aftermarket is thin.
DDNS
\nDDNS, or Dynamic Domain Name System, is a service that maps internet domain names to IP addresses as those IP addresses change. Traditional DNS servers provide a fixed IP address for a domain nam...
.CO.UK
The commercial second-level extension under Britain's .uk, run by Nominet. Expired names are suspended for 90 days, then dropped without auction.
.CC
The country code for the Cocos Islands, operated by Verisign and marketed as a .com alternative. Had a run of popularity in China.