Test your internet connection speed, Bandwidth Results by analyzing the efficiency of your connection during a large file download. What you are testing is not just the speed into your computer, but the speed of the slowest link between you and the test server.
IPcalc takes an IP address and netmask and calculates the resulting broadcast, network, Cisco wildcard mask, and host range. By giving a second netmask, you can design sub- and supernetworks. It is also intended to be a teaching tool and presents the results as easy-to-understand binary values.
Looking Glass utility allows to make a number of inqueries such as Traceroute, Ping, BGP advertise-routes, BGP summary as from IPTriplePlay routers as well as from other ISPs Looking Glass servers.