DomainTools - Domain name research, including comprehensive Whois Lookup, Reverse Whois Lookup and Whois History.
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
WhoisAPI - WhoisAPI is the premier provider of freshly parsed whois data for domain names and IP addresses...
ipinfo.io - Simple IP address information.
JsonWhois.io - JsonWhois is the leading cloud hosted Whois API.
ifconfig.co - What is my IP address? — The best tool to find your own IP address, and information about it.