UA: Mozilla/5.0 (compatible; Lipperhey Link Explorer; http://www.lipperhey.com/) robots.txt: no
This is not a "link checker" per sey. It seems to be a tool that finds incoming links to your site, then suggests a link strategy built from sites in their database. Another one of those making money off your content schemes.
Server Farm: WideXS, Netherlands Host: spiders.lipperhey.com 18.104.22.168 - 22.214.171.124 126.96.36.199/28
However tLipperhey offers software, so these data mining crawls may come from any IP address of any machine running this program.
I have the range blocked for the past couple of years and I THINK my system will catch the UA but I'll make extra sure in view of the distribution possibility. Hopefully it will advertise as such. Thanks. :)