API Available
Tools that offer a documented API for programmatic access to their data.
Censys
Search engine for internet-facing hosts, certs, and services.
FreemiumDual-use
Have I Been Pwned
Checks emails/accounts against known breaches.
Free
Hunter.io
Finds and verifies professional email addresses associated with a domain.
FreemiumDual-use
SecurityTrails
Historical DNS, WHOIS and subdomain data for domains and IP addresses.
Freemium
Shodan
Search engine for internet-connected devices, servers, and IoT.
FreemiumDual-use
VirusTotal
Scans files and URLs against many engines and aggregates threat intel.
Freemium