ok long shot, but worth a try, if they set you up as a house move & you havent reg'd the cable modem since the housemove, you could try this.......as i said a long shot but may work,
plug in the terayon, should pick up an ip ending in +248, as it wont be registered ( ie has been removed ), try to browse to this website :
https://autoreg.autoregister.net/cgi/housemove
will need username & password of main email account, though this will only work if you have been set up for a housemove.
Worth a try...& try not to lose the terayon aswell
Ps...if it does work, im expecting an invite to the next party