Run an nslookup from command line on your IP - you can find this by clicking the Connection button on the forum.
This is mine - Mapperley UBR, few things censored for obvious reasons.
Name: xxxx-
mapp2-0-0-xxxx.nott.cable.ntl.com
Address: 86.3.208.xxx
Looking at a tracert:
Tracing route to bbc.co.uk [212.58.228.155]
over a maximum of 30 hops:
1 5 ms 1 ms 1 ms 192.168.2.1
2 11 ms 12 ms 38 ms
10.234.140.1 <-- UBR address
[You can't nslookup it though, as it's a private range address.]
*** Just wondering anyway, because the net has been intermittently freezing, 404/504 errors, last few days. Can't be a proxy, unless there is one explicitly set, because they're off in Nottm. ***
Edit 2: and this is meant... to be a 2 Mb connection - it's just been automatically upgraded