Status checker for hundreds IP addresses

Question

I wonder how to make a status checker, checking about 500 addresses in a few minutes? (it\'ll check a certain port if its listening).

But I care about the performanc

Answer 1

Your best bet might be to use a dedicated port scanner like nmap. I don't know the command-line options off the top of my head, but it should be possible to output a results file and just parse it from PHP.