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Examples: domaintools.com, whois.sc, 127.0.0.1
DomainTools.com supports more Top Level Domains (TLDs) than any other WHOIS service. In addition to the popular Generic TLDs like .COM, .NET, .ORG, etc., we also support hundreds of Country Code TLDs (ccTLDs). We offer a basic DNS check for those registries which don't provide standard WHOIS access and our site is IDN friendly, making it easy to find available domains in other languages.
There are many websites offering a basic WHOIS lookup service, but our site offers extensive historical information including WHOIS, IP Address (website hosting), Name Server, Registrar and Thumbnail history to help provide a complete view of a domain name's past. When buying a domain from someone you may not trust, make sure you protect yourself by researching the domain's history.
DomainTools.com offers a very powerful tool called Reverse WHOIS which makes it possible to discover other domains owned by the same organization. This premium tool can be used to research spammers and trademark violators or used for competitive analysis. You can also set alerts to watch for future changes.
In 2006, WHOIS.SC (Whois Source) became DomainTools to reflect our expanded toolset for domain research beyond WHOIS. In addition to a simple availability check and registration information, we now offer Domain Name Suggestions, Trademark Monitoring for Brand Protection, Domains For Sale, DNS Tools and more.