Use only for lawful, authorized research. Do not use for stalking, harassment, doxxing, or unauthorized profiling.
Breach data indicates past exposure — it does not confirm current account compromise or identity.
Domain checks
Run email security record lookups (MX, SPF, DKIM, DMARC) on the sending domain using the tools below.
Lookup resources
External lookup sites receive the email address you search there. Review their terms and privacy policies before continuing.
Breach data indicates past exposure events — it does not prove current access, active compromise, or identity.
Platform username guesses
These are constructed URL guesses using the local-part of the email address.
Most will return a 404 or empty page until manually verified. Not all platforms use email usernames for profile URLs.