Find out your IP Address.
Whats My IP is a useful tool that helps you easily find your IP address.
Check whether a website is online or not.
Measure Ping for any Address.
Get Hostname from any IP Address
Get IP Address from a Hostname
Find out your user agent.
Online dnslookup is a web based DNS client that queries DNS records for a given domain name.
The open port checker is a tool you can use to check your external IP address and detect open ports on your connection.
IPv4 and IPv6 Subnet Calculator