== CBL listings broken down by ISP

Chris Lewis of Nortel recently posted a breakdown of CBL listings by
ISP in news.admin.net-abuse.email. Here's the top ten of his listing:

>  375649 chinanet.cn.net
>  130245 cnc-noc.net
>  102931 telekom.gov.tr
>  80936 kornet.net
>  67721 tpnet.pl
>  51671 dtag.de
>  47246 rain.fr
>  33678 interbusiness.it
>  33500 hananet.net
>  28433 hinet.net

The article itself can be found
[[here|http://groups.google.com/group/news.admin.net-abuse.email/msg/d02b7196833ae454]]
(Message-ID <dmnk30$6m5$2@zcars129.ca.nortel.com>), and is worth
reading for the full list.

The resulting subthread suggested that US-based ISPs are so low in the
listings because many of them have blocks on outgoing port 25
connections from cablemodem and home DSL lines.

I'm a bit surprised by the list; I had no idea China was so bad (note
that cnc-noc.net is Chinese), or that Turkey would be in third place.
dtag.de (Deutsche Telekom) doesn't surprise me at all, as I have a
number of systems that have been slammed by a large and aggressive
collection of open proxies in their t-dialin.net and t-ipconnect.de
domains.