Go

Currently running this bitch on a server with 24 processors clocked at 2.6Ghz, 16GB of ram and fiber connection. Currently pinging about 300-400 IP addresses/second. And the glue holding this bitch together is Go. Look at that simple concurrency model and message passing, it's a thing of fucking beauty. Now to get this running on the other 4 servers just like it.

http://pastebin.com/rqEvpszX
Currently running at: 177 valid IPs/second, 582 IPs/second

And I know that the last part is a little hacky and that the IP functions should be moved to their own source file. Bite me.

Why aren't you using Go /prog/?

because the memory management is fucked. You're keeping ints and pointers in automatic storage, and only cleaning them out with non-exact GC, that blows out all your memory all the time on i386 since the runtime is too stupid to tag values properly according to their type

https://groups.google.com/group/golang-nuts/browse_thread/thread/ab1971bb9459025d