Blacklists Compared

25 August 2001

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Survey results for all known public IP-based DNS blacklists.

  Hits   DNS Zone
  5822  (total number of IP addresses tested, including 290 at SDSC)
  1149  (union of all zones except xbl.selwerd.cx)
  1037  xbl.selwerd.cx
   438  outputs.orbz.org
   279  inputs.orbz.org
   272  relays.ordb.org
   264  or.orbl.org
   207  blackholes.intersil.net
   200  blackholes.five-ten-sg.com (result 127.0.0.4 = unconfirmed opt-in)
   152  relays.mail-abuse.org
   111  relays.osirusoft.com (result 127.0.0.2 = relay)
   109  orbs.dorkslayers.com
   102  block.blars.org
    80  ipwhois.rfc-ignorant.org
    59  dev.null.dk
    53  blackholes.five-ten-sg.com (result 127.0.0.2 = spam source)
    50  spammers.v6net.org
    44  blackholes.five-ten-sg.com (result 127.0.0.3 = dialup)
    24  relays.osirusoft.com (result 127.0.0.3 = dialup)
    20  blocktest.relays.osirusoft.com (not a blacklist!)
    18  dialups.mail-abuse.org
    12  ztl.dorkslayers.com
     5  blackholes.mail-abuse.org
     4  relays.osirusoft.com (result 127.0.0.6 = spamware vendor)
     2  orbz.gst-group.co.uk (result 127.0.0.3 = relay)
     2  relays.osirusoft.com (result 127.0.0.4 = spam source)
     1  orbz.gst-group.co.uk (result 127.0.0.2 = relay output)
     1  blackholes.five-ten-sg.com (result 127.0.0.5 = should be listed at MAPS)
The web sites listed below provide detailed information about the DNS zones listed above, including their listing policies.

There is no known description of the blackholes.intersil.net zone. The XBL is excluded from the zone union because of of its extremely aggressive listing policy, but otherwise is included for completeness.
This document was last updated by Jeff Makey <jeff@sdsc.edu> on 25 August 2001.