Hunter.io
Finds and verifies professional email addresses associated with a domain.
Hunter.io is a freemium tool that identifies and verifies professional email addresses associated with specific domains. It is commonly used by researchers and investigators to map out organizational contact structures and validate potential points of communication. The service helps users confirm the existence of email patterns within a company's digital footprint.
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.
Official site: https://hunter.io
Last verified 2026-08-31.