I would suspect that D-Link on the phone would still ask for proof of purchase? Besides, I couldnt find a phone number anywhere..
I've just found an old Chrome shortcut to http://192.168.1.59/ labelled as "D-Link Congifuration Page" so i suspect this was the IP, however with the unit connected directly to the modem, this brings up nothing. Would it be the case that as I've moved from connecting it via a hub to connecting it directly, the IP has changed?