Not that I know of.
As most spam-bots and the like are probably running on compromised home machine any such list would be quickly out of date, as some hosts are cleaned and the bot gets introduced to other hosts by some means, and wouldn't be overly useful anyway - just about all you could do is block web traffic from the hosts on the list or add a message to the web server's scripted responses to inform the user that they may be infected.
Give a message to the user is a waste of time IMO - many will ignore it, many that should see it won't as you will not haver their correct address in the database (due to them not having a fixed address, accessing through a proxy that has more than one outward facing address, or their legitimate traffic going through a proxy that the bot traffic bypasses, and those that you do manage to correctly inform of the issue will probably expect you to know how to fix it for them...