Jay Westerdal (born 1978) is an American domainer and entrepreneur, best known for his work creating DomainTools.com, a web service that looks up historical ownership of a website.
The whois service was integrated into Google's onebox in May 2008.
[1] He later sold the company in 2008 for a reported $16–$18 million.
[2] Westerdal's personal blog covers a wide range of topics, focusing mainly on technology, his mobile lifestyle, and search engine optimization from a personal perspective, in contrast to the DomainTools blog, where he wrote in an official capacity.
He contributed to the EPP Protocol RFC 4930.