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Namechk is a free web application[1] created by David Goose and Jeremy Woertink. Namechk allows someone to view if a certain username is available. Namechk has over 98 different social network sites as of June 2019.[2][3]
The service also checks domains.
Knowem is an alternative to Namechk and contains over 500 different social network sites.[1][4]
Search over 500 popular social networks, over 150 domain names, and the entire USPTO Trademark Database to instantly secure your brand on the internet.