Does such service exist?

[Red Squirrel]

I was thinking of putting together a DB of all the IPs I block due to spam, hackers, known proxies etc... this would help cut down on malicious use of services such as spamming forums, if I catch them once, they would not have chance to spam up my other forums if each forum checks the same block list. I could also auto block proxies by having it query up online proxy lists.

But before I reinvent the wheel, does such service online already exist? Kinda like RBL, but for web services. So you can basically block IPs off your site before they get used maliciously.

To be even more advanced some special port scanners could go around scan networks for infected machines and block those too.

I think this could greatly help reduce spam and other malicious use of services such as forums, game servers, etc.

 

[redbeard1]

Opendns

 

[Red Squirrel]

Isin't that just to block internal network users access to certain hosts? I need to do this at the IP level.

ex: site A has a spammer from IP 1.2.3.4 and submits it to the block service. Spammer then goes on site B to try and spam that forum, but that IP is already blocked because the owner of site A submitted it to the list.

This would be coded in at php level, so like, maybe a quick tcp socket query or something.