Up until about a year ago it was the Russians who were the main problem. As a webadmin I can testify that the Chinese hackers are now the biggest threat, at least on the commercial sites that I manage.
The attack attempts have been flooding my logs with 10000+ attempts/day.
We recently banned all Chinese IP addrs at the firewall. We get less than 0.1% sales from China and most of those are stolen credit cards anyway. (We banned Russia years ago for the same reason.)
Where would I find a list of the IP ranges used by China and Russia? simply banning both makes too much sense to not do it.
That must be a massive database, though. I already hit the size limit for my .htaccess for my site denials..there are so many IP adresses. You must have to work on it constantly.
Any tips will be appreciated!