WhoCalledLookup

WhoCalledLookup is a free US phone number lookup and spam-check service designed to help people understand who may have called before they call back. Visitors can search a 10-digit number and view its assigned carrier and rate-center location, along with available reports from consumers and records of complaints submitted to the Federal Trade Commission (FTC) and Federal Communications Commission (FCC). The service explains when a number has little or no information available and does not present itself as a people-search site or claim to identify private subscribers.

Its resources include number-specific report pages, area-code and state guides, lists of frequently reported and frequently searched numbers, and summaries of complaint trends and robocall campaigns. Users can also explore downloadable charts and CSV data on FTC complaints by area code, state, and subject. Community members may share descriptions of calls and vote on whether they seem like spam, safe, or missed calls; reports are moderated and exclude personal details.