Username & Social Media Tracking
Namechk
Checks whether a username or domain is available or already taken across many sites.
Namechk is a freemium service that checks whether a specific username or domain name is available or already taken across numerous websites and platforms. It allows users to verify the status of a chosen handle in a single search rather than visiting each site individually. This tool is commonly used by researchers and investigators to map out an individual's digital footprint or to ensure a brand name is not already in use.
Dual-use tool. This is capable of legitimate research (journalism, security, due diligence) and of harassment or stalking. Listing it here is not an endorsement of either use.
Privacy note. Reusing one username lets tools like this link all of your accounts together.