Here’s a useful list domain and IP API tools. Let us know if there are other APIs that should be on this list (firstname.lastname@example.org
Name Toolkit API
Name Toolkit is a domain name suggestion, registration and whois info provider. Our focus is on speed, simplicity and honesty.
The WebKnox proxies API lets you retrieve public proxies. We try to keep a list of fresh, unblocked, high responsive, and alive proxies.
IP Utils API
A simple component helping with IP functionalities
Ping an IP or URL