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The SMTP IPv4 DNS Block List.
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WHAT WE DO:
Operate the largest and most effective SMTP IPv4 DNS Block List Service. (Read the Acceptable Use Policy here)
Via two publicly available services:
  1. The V4BL/FULL Block List - which is a commercial/pay-for-use service; but, it can now also be accessed indirectly via several public global DNS services (more details).
         Available to any IPv4 capable DNS client and now holds 656 Million IPs.
  2. The V4BL/FREE Block List - which continues to be completely FREE and OPEN for public use at your own risk and discretion.
         Available to any IPv4 capable DNS client and now holds 176.9 Million IPs.

FREQUENTED LINKS:
  Is my email server listed? (How can I get my IP delisted)
  List Usage: Acceptable Use Policy/Abuses/Misuses. (How can I use this list?)
  E-mail server basic setup steps
  Some very basic troubleshooting steps
  Some typical reasons IPs get listed.
  HOWTO: Thank us properly.
  Why V4BL?

SOME STATS:
Over the last 30 days: V4BL Block List has been updated by one IP every 0.225 seconds.
Over the past year the list has grown by 137,659,341 IPs. Oldest IP: 1930 days listed.
At any given moment, there are more than 150M new IPs queued awaiting basic compliancy checks.
See our historical results/progress here.


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