This website has loads of tools for online testing. see below:

Tools
Port Forwarding Tester -> find open ports on your connection
What Is My IP Address -> quickly identify your external IP address
Network Location Tool -> locate a network using Google Maps
Visual Trace Route Tool -> plot the route to a network address
Phone Number Geolocator -> find out who's calling
Reverse E-mail Lookup Tool -> figure out who's e-mailing
Reverse IP Domain Check -> find other sites on a web server
WHOIS Lookup Tool -> check to see if a domain name is available

Other
Cloud Performance Tools -> compare cloud vendors and CDNs