Exploding Coffee » Auto Block List
This server has been my personal server for quite some time, and having it publicly accessible as a web server automatically attracts some attention.
To that end the server has a fairly standard system that automatically blocks IP addresses that attempt to do stuff they shouldn't, like repeatedly attempting to log in.
This here is a quick chart I put together from the list of recently (two months) blocked addresses. The bars represent various IP lists (sourced from https://github.com/firehol/blocklist-ipsets) and the values (note the log scale) represent the percentage of my block list they contain.