It appears that I have sshed into visesh's computer... this is weird... Is the whole of cambridge on the same subnet, or I am thinking the IP I'm using is actually not a subnet IP?
Cambridge has a few class B networks*, both public valid ones and private ones. You've probably been moved to a private one? This just means that the outside world knows nothing about it but all the routers in Cambridge do so you can go inter-college without problems.
*=131.111, 128.232, and engineering's are the public ones iirc.