bl.ofdoom.com is an automated real time blocking list generated from attempts to email nonexistent accounts, on a few domains.
It follows these rules:
- Each attempt to email a nonexistent address adds one point to the /24 net block containing the offending IP address.
- When the score for a net block is greater than 15, that /24 block gets added to the block list.
- When the score for a net block has not increased for 8 hours, one point is taken away every hour.
- When the score drops below 15, the /24 block is removed from the block list.
The block list can be queried via dns from rbl.ofdoom.com, in the usual manner for an ip based blocklist.
Currently there are 5 blocks on the list.
Top ranking netblocks.
To check if an address is blocked, enter it here: