Were they LimeWire 4.21.1 (rc) hosts, if so get rid of them. They're spammers. Also if you block port 27016 from your firewall this will help stop connecting to some spammers. Rather embarrassingly I found my Gnucleus connection file had 30% of these spammers with port 27016. Fixed now though after Birdy's advice about the firewall and her research on LimeWire 4.21.1 on my behalf.

I suspect the new gwebcache sites are more trusty than the old ones that come with the full-version regular BearShare installer. At least one of the old gwebcache sites seems to give out-of-date connection data (but perhaps that was just the effect on me.)