dstiles - 8:29 pm on Oct 20, 2011 (gmt 0)
Sorry, I thought I'd seen it in DNS as that but DNS actually says "IP Service Delivery Network", which is somewhat ambiguous (as are many DNS entries). Not sure where I got the "mobile" bit from now - possibly from their web site as "phone" provider.
I had originally listed the range in my database as dynamic until this thread, when a bit more investigation showed me the hosting etc aspect on the higher IPs. I accept that SOME of the range may be dynamic/static DSL but the higher IPs are suspicious (to me) so I invoke my right to block them. :)
Regarding the UA that pfui posted: that is certainly some kind of bot UA (or a badly mangled browser or proxy that had to have been fiddled with).