This time it's an IP scanner. Small, quick and easy to use. Also unstable. It requires NetPacket, Net::RawIP and Net::Pcap. A recent version of each is probably a good idea.

It's based on an idea I've wanted to try for a long time; here's how it works:

> Two threads total
> One thread sends SYN/PSH packets
> One thread collects and logs ACKs
> That's it

I'm having success with it, it does around 11 thousand hosts per second for me. It's kind of unstable and really really untested, but it's fun to use in any case. Check it out if you feel like it.

http://mastercj.net/software/rscan/0.1/rscan.pl

UPDATE: See http://mastercj.net/blog/e/6/Net::RawIP_patch/ if you're getting "sendto()" crashes.