I have found more info that I had saved to CD. The offending IP addy was 96.236.170.198 which when checked with ROBTEX and SORBS came back as being in the blacklist.
latest news: Jan 26: new version of the shared tab with more extensive DNS-relationships
96.236.170.198 LISTED IN BLACKLIST! dnsbl.sorbs.net dul.dnsbl.sorbs.net
sorbs.dnsbl.net.au
t1.dnsbl.net.au
summary
server type
route name
as name
baserecordnameipreverserouteas
96.236.170.198!!2
dot
...
blocklistlinkstatusdescriptionreddnsbl.sorbs.net
link (127.0.0.10) - Aggregate zone (contains all DNS zones) dul.dnsbl.sorbs.net
link (127.0.0.10) - Dynamic Address ranges (NOT a Dial Up list!) sorbs.dnsbl.net.au (127.0.0.2) t1.dnsbl.net.au
link (127.0.0.2)