WhoisAPI - WhoisAPI is the premier provider of freshly parsed whois data for domain names and IP addresses...
Oribi - Analytics for marketing & product teams
GetWhoisData - Whois Database Download using FTP. Instant Access. Daily Update. No download Limits. supports 13 TLDs and 677 gTLDs. Country wise database
Antideo - Email, IP address and phone number validation API service
Whois.net - Whois lookup for domain name search, registration and availability.
BrandHunt V2 - Search/track domain & social media handles in real time.