WhoAPI service allows you to get extensive domain data using the API on a massive scale. Data like bulk domain availability querying, WHOIS, DNS zone and ranks.
Whois information contains information about domain owner, name, last name, company name, address, telephone number and email address. Whois information is, and should be public information (like the yellow pages). We simplify that information and add other valuable data that determines the value of a domain name which can also be used to valuate some email addresses.