Michael wrotehttps://bustimes.org/regions/NEBut don't take what it reports as gospel!
Click on what company you want, then scroll down to
Unofficial, incomplete fleet list
(Basically the tracking is through the ticket machines, so if the ticket machine isn't set up to report correctly, the tracking won't be right. There's many reports of vehicles tracking under a different identity! From what I can see, the north east operators seem to be getting it pretty much right, but First in Bristol tracking should be regarded as a suggestion at best!)