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Blacklist Statistics Center
Welcome to the DNSBL Resource Blacklist Statistics Center.
As of October 2007, now tracking 50+ blacklists!
For week-by-week success and failure data for a specific blacklist, select a blacklist from the list below.
Blacklists with data available for public display:
Each blacklist detail page contains thirteen weeks worth of data, graphically represented. Each green bar represents the weekly average percentage of
spam that would be blocked by use of that list. Each red bar represents the weekly average percentage of ham (non-spam) that would be blocked by use of
that list. The spam and ham buckets are unique; therefore it is possible to have both a high accuracy rate against spam and a high false positive rate
against non-spam.
For every 10% of accuracy, ten out of one hundred spams were successfully blocked by a given list. For every 5% of inaccuracy, one out of every twenty
desired emails was blocked by a given list.
| Quick DNSBL Stats |
| 21 days |
4700 spams | 1187 hams |
| DNSBL Zone | Accuracy %
(against spam) | Inaccuracy %
(against non-spam) |
| zen.spamhaus.org | 74% |
0% |
| bl.spamcop.net | 61% |
0% |
| psbl.surriel.com | 46% |
1% |
| l2.apews.org | 72% |
12% |
| blackholes.five-ten-sg.com | 25% |
52% |
View the Data Interpretation Guide for a quick overview of how
this data is compiled. For a more detailed understanding of what constitutes spam and ham (non-spam), this
page provides further insight.
For more information on blacklists, vist the DNSBL.com main page. For more information on
spam prevention, list management best practices, and spam-related commentary, visit partner site Spam Resource.
This page was last updated: Mon May 12 00:15:26 PDT 2008.
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