Does anyone have a complete list of fake / bad IP addresses?

I need it for my business to block unwanted postings.

I Googled and saw some sites here and there with small lists.

If you don't have a list, can you at least point me in the right direction?

Thanks!

 

You can check out Spamhaus
http://www.spamhaus.org/sbl/

 

You may wish to use the ZEN blocklist, as opposed to just the SBL.

http://www.spamhaus.org/zen/

 

You could also use a service such as the one provided by CloudFlare which attempts to block known content spammers.

 

Keep in mind, no blacklist is complete like you asked for in the title. A blacklist is just one layer that you can implement in your approach to security. The lists given are good, but don't expect that your site is now magically protected because you're using a good blacklist.