netstat

All network tools (netstat, whois, ping, dns query, ipconfig) rolled into one!

It lets you see how quickly your data goes from your computer to another compute

Monitor your Internet and network connections.

Monitor your Internet and network connections. With IP-Lookup tools & more.

Monitors your computer's network connections in realtime.

Monitor your network and Internet connections and the programs behind them.

CallerIP shows you who is connecting to your system, one feature likes Netstat.