Where can I get i.p(internet protocol) detectors?

Question

Any free downloads?

Answer 1

What do you mean?
If you want to see what protocols you have running on your machine then you probably have it. If you have WinXp then you have a program called netstat

If you want to scan other machines then you already have that also. Its called netstat

If you want to connect to them then you have that. Its called telnet