Whitelist functionality.

[ip-rw]

Really interesting project, I'm having quite a lot of fun playing with it.

Sometimes it's desirable to have a whitelist of prefixes (or to be able to specify more than one prefix to scan)

I've rather lazily just reused your blacklist stuff and thrown an extra if statement in 'addrProcessFunc' to see check if the generated IP falls within the whitelisted CIDRs which does the job but really needs to work faster.

Are you still interested in this project? It seems to do a rather good job and it could be a lot quicker with a few tweaks I think. I'm happy to send pull reqs, but if you've moved on then I won't bother and I'll just hack it around as I need it )

Can I have the no doubt gigantic DB of ips you collected pls :)? Sites down btw.