ipinfo.io - Simple IP address information.
Whoisology - Connected database of whois records and whois history
IPTools - The "IP Tools" is powerful and handy application for network analyzing.
Bulk Whois API - Bulk Whois API is a provider of parsed WHOIS data in JSON with simple API, competitive pricing, top notch support, and more.
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...