Realtime Black Lists (RBL)

To identify possible SPAM incoming to their email servers, ISPs often use RBL.
These Black Lists, based upon the IP are updated according to user complaints.

These blacklists can be queried on demand to check the listing of a given IP.

I made a list of known Realtime Black Lists.

As always, should anything be missing, please send me an email or comment on the blog.