As part of our on-going anti-spam policy, we now temporarily de-route (ie, refuse to communicate with) IP addresses who have recently been attempting to send mail to users who do not exist on our service, an excessive number of times within an hour.

Experience has shown that these are generally "probes" from spammers, or are actually part of a spamming run. It is our aim to detect these within a second or two, and automatically block the source.

In order to minimise collateral damage (ie, refusing mail from legitimate sources), we deliberately do not send back any sort of failure notice (which may lead the other end to bounce or return the mail), instead we simply refuse to talk to the sending site for a period of time. Legitimate sources will queue the mail and try again later, at which time our system will have resumed listening, and will accept the mail.

Due to some particularly busy spam events, the list of addresses has become unacceptably long and is no longer being displayed. If you use (or used) this page to get addresses for your own blacklist, please use one of these links instead:
If you simply want to check to see if an address is listed, use this form:
(you must use a dotted-quad address and not a FQDN, eg 192.168.3.56)


Total of 10814 IP address (ranges) blocked
Worst offender address blocks:
Sorted by IP address     Sorted by number de-routed
   1 .0.0.0/8
   1 4.0.0.0/8
   1 8.0.0.0/8
  47 12.0.0.0/8
 238 24.0.0.0/8
  40 41.0.0.0/8
   1 43.0.0.0/8
 109 58.0.0.0/8
  69 59.0.0.0/8
  66 60.0.0.0/8
  76 61.0.0.0/8
 141 62.0.0.0/8
  19 63.0.0.0/8
  56 64.0.0.0/8
  80 65.0.0.0/8
 132 66.0.0.0/8
  56 67.0.0.0/8
 136 68.0.0.0/8
  92 69.0.0.0/8
 102 70.0.0.0/8
 396 71.0.0.0/8
 182 72.0.0.0/8
  87 74.0.0.0/8
 126 75.0.0.0/8
 161 76.0.0.0/8
 176 77.0.0.0/8
 120 78.0.0.0/8
 114 79.0.0.0/8
 171 80.0.0.0/8
 236 81.0.0.0/8
 296 82.0.0.0/8
 317 83.0.0.0/8
 270 84.0.0.0/8
 325 85.0.0.0/8
 187 86.0.0.0/8
 222 87.0.0.0/8
 303 88.0.0.0/8
 307 89.0.0.0/8
  40 90.0.0.0/8
 111 91.0.0.0/8
  30 92.0.0.0/8
  29 96.0.0.0/8
  21 97.0.0.0/8
  27 98.0.0.0/8
   6 99.0.0.0/8
  12 116.0.0.0/8
   8 117.0.0.0/8
   8 118.0.0.0/8
  39 121.0.0.0/8
  39 122.0.0.0/8
  37 123.0.0.0/8
  95 124.0.0.0/8
 136 125.0.0.0/8
   2 129.0.0.0/8
   9 130.0.0.0/8
   1 131.0.0.0/8
   1 134.0.0.0/8
   1 135.0.0.0/8
   1 136.0.0.0/8
   3 138.0.0.0/8
   1 139.0.0.0/8
   4 140.0.0.0/8
  22 141.0.0.0/8
  11 142.0.0.0/8
   2 144.0.0.0/8
   3 146.0.0.0/8
   1 147.0.0.0/8
  13 148.0.0.0/8
   4 149.0.0.0/8
   2 150.0.0.0/8
  98 151.0.0.0/8
   2 152.0.0.0/8
   2 155.0.0.0/8
   7 157.0.0.0/8
   3 162.0.0.0/8
   4 164.0.0.0/8
   5 165.0.0.0/8
   7 166.0.0.0/8
   1 167.0.0.0/8
  14 168.0.0.0/8
   1 169.0.0.0/8
 668 189.0.0.0/8
 774 190.0.0.0/8
   3 192.0.0.0/8
  39 193.0.0.0/8
  34 194.0.0.0/8
  69 195.0.0.0/8
  49 196.0.0.0/8
   2 198.0.0.0/8
   4 199.0.0.0/8
 661 200.0.0.0/8
1078 201.0.0.0/8
  62 202.0.0.0/8
  96 203.0.0.0/8
  17 204.0.0.0/8
   9 205.0.0.0/8
  15 206.0.0.0/8
  52 207.0.0.0/8
  25 208.0.0.0/8
  29 209.0.0.0/8
  58 210.0.0.0/8
  45 211.0.0.0/8
  99 212.0.0.0/8
 152 213.0.0.0/8
  52 216.0.0.0/8
 124 217.0.0.0/8
  78 218.0.0.0/8
  40 219.0.0.0/8
  50 220.0.0.0/8
  47 221.0.0.0/8
  61 222.0.0.0/8
   1 .0.0.0/8
   1 131.0.0.0/8
   1 134.0.0.0/8
   1 135.0.0.0/8
   1 136.0.0.0/8
   1 139.0.0.0/8
   1 147.0.0.0/8
   1 167.0.0.0/8
   1 169.0.0.0/8
   1 4.0.0.0/8
   1 43.0.0.0/8
   1 8.0.0.0/8
   2 129.0.0.0/8
   2 144.0.0.0/8
   2 150.0.0.0/8
   2 152.0.0.0/8
   2 155.0.0.0/8
   2 198.0.0.0/8
   3 138.0.0.0/8
   3 146.0.0.0/8
   3 162.0.0.0/8
   3 192.0.0.0/8
   4 140.0.0.0/8
   4 149.0.0.0/8
   4 164.0.0.0/8
   4 199.0.0.0/8
   5 165.0.0.0/8
   6 99.0.0.0/8
   7 157.0.0.0/8
   7 166.0.0.0/8
   8 117.0.0.0/8
   8 118.0.0.0/8
   9 130.0.0.0/8
   9 205.0.0.0/8
  11 142.0.0.0/8
  12 116.0.0.0/8
  13 148.0.0.0/8
  14 168.0.0.0/8
  15 206.0.0.0/8
  17 204.0.0.0/8
  19 63.0.0.0/8
  21 97.0.0.0/8
  22 141.0.0.0/8
  25 208.0.0.0/8
  27 98.0.0.0/8
  29 209.0.0.0/8
  29 96.0.0.0/8
  30 92.0.0.0/8
  34 194.0.0.0/8
  37 123.0.0.0/8
  39 121.0.0.0/8
  39 122.0.0.0/8
  39 193.0.0.0/8
  40 219.0.0.0/8
  40 41.0.0.0/8
  40 90.0.0.0/8
  45 211.0.0.0/8
  47 12.0.0.0/8
  47 221.0.0.0/8
  49 196.0.0.0/8
  50 220.0.0.0/8
  52 207.0.0.0/8
  52 216.0.0.0/8
  56 64.0.0.0/8
  56 67.0.0.0/8
  58 210.0.0.0/8
  61 222.0.0.0/8
  62 202.0.0.0/8
  66 60.0.0.0/8
  69 195.0.0.0/8
  69 59.0.0.0/8
  76 61.0.0.0/8
  78 218.0.0.0/8
  80 65.0.0.0/8
  87 74.0.0.0/8
  92 69.0.0.0/8
  95 124.0.0.0/8
  96 203.0.0.0/8
  98 151.0.0.0/8
  99 212.0.0.0/8
 102 70.0.0.0/8
 109 58.0.0.0/8
 111 91.0.0.0/8
 114 79.0.0.0/8
 120 78.0.0.0/8
 124 217.0.0.0/8
 126 75.0.0.0/8
 132 66.0.0.0/8
 136 125.0.0.0/8
 136 68.0.0.0/8
 141 62.0.0.0/8
 152 213.0.0.0/8
 161 76.0.0.0/8
 171 80.0.0.0/8
 176 77.0.0.0/8
 182 72.0.0.0/8
 187 86.0.0.0/8
 222 87.0.0.0/8
 236 81.0.0.0/8
 238 24.0.0.0/8
 270 84.0.0.0/8
 296 82.0.0.0/8
 303 88.0.0.0/8
 307 89.0.0.0/8
 317 83.0.0.0/8
 325 85.0.0.0/8
 396 71.0.0.0/8
 661 200.0.0.0/8
 668 189.0.0.0/8
 774 190.0.0.0/8
1078 201.0.0.0/8
Additional routes dropped since 18:00 today usage
Technical stuff for geeks and other system admins.