Calculate subnet network using network class
Check a port's status easily, find out which ports of your connection is open or closed.
Locate and find out where a network is on the Earth using Google Maps
Find out other sites hosted on a web server and if the server is dedicated or not
Check and find if a domain name is available or who is it’s owner
Find out ip address owner
A free ping service, ping to any domain or IP address from worldwide locations
Check if you are behind a proxy or not