scan with netcat

nc(1) can be used for simple and fast network scan. Here is sample of localhost scan (ports range: 1-1024).

$ nc -v -z 127.0.0.1 1-1024
localhost [127.0.0.1] 80 (www) open
localhost [127.0.0.1] 25 (smtp) open
localhost [127.0.0.1] 22 (ssh) open