D. D. N. S. B. L.
Dynamic Domain Name Spoofers Block List
Separating the haystacks from the needles, (even if only by) one straw at a time.
v4BL.org - You had me at EHLO :~]


The DDNSBL is an automatically updated list of email related IPv4 addresses, that now includes:
Well known spammer IPs, UBE/UCE abusive IPs, rfc-ignorant IPs, IPs with mismatched DNS and RDNS, botnet IPs, etc.
(A very large list of IPs provided to help stop unwanted emails from reaching your inbox.)
The DDNSBL (IP.v4BL.org) is currently the largest known free list of its' kind.

Current DDNSBL Active IP List Count: 138,616,301
You can see a current indenpendent measurement of our list result here at: http://www.sdsc.edu/~jeff/spam/cbc.html. Lastest results show 77.3% hitrate (spams being detected.)
Oldest IP: 984 days listed. Over the last 30 days: DDNSBL blocklist has been updated by one IP every 0.100 seconds.
Over the past year the list has grown by 131,012,384 IPs.

List Status: OPEN for free public use. (Use at your own risk and discretion.) The list is intended for actual inbound email server IP reputation verification use only. Do not abuse the system (with unnecessary scanning, excessive requests, etc.) Abusive requests will be denied! For best results DNS admins should ensure that zone "IP.v4BL.org." is not forwarded through any anonymous DNS servers/service.