Ip2Whois

Domain WHOIS lookup API for registrar info, registration and expiration dates, domain age, and hosted-domain discovery.

Useful for compliance and threat-research tools that pull WHOIS records for a domain and list domains hosted on a given IP address.

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Hosted Domains Lookup
Tool to retrieve hosted domains for a given IP address. Use this after validating the IP.
IP2WHOIS Domain Lookup
Retrieves WHOIS registration data for any domain. Returns registrar info, registration/expiration dates, domain age, nameservers, and contact details (registrant, admin, tech, billing). Use to investigate domain ownership, check availability, verify legitimacy, or research competitors. Note: Some data may be redacted due to WHOIS privacy protection.

Crowdsourced IP reputation database for abuse reports, blacklists, IP and CIDR reputation, and security signals.

Email validation service for single and bulk address verification, email finding, MX and WHOIS lookups, and domain enrichment.

UK Telephone Preference Service lookup for verifying TPS and CTPS registration on phone numbers.