Email Checker - Email Checker offers a real-time API and bulk validation for list cleaning.
ipdata.co - Get the Geolocation, Organisation, Currency, Timezone, Calling Code, Flag, Proxy, Tor and Threat intelligence data from any IPv4 or IPv6 address.
Atomic Mail Verifier - Email Verifier offers a comprehensive three-step verification process designed to help you identify and eliminate a significant number of non-existent email addresses.
ipinfo.io - Simple IP address information.
ZeroBounce - Removes invalid emails from your list to prevent email bounces from ruining your deliverability.
ifconfig.co - What is my IP address? — The best tool to find your own IP address, and information about it.