Actually, his hostname doesn't have any obvious information in it (user-<randomnumber>.cable.<nationalisp>.com). A traceroute only yields information if you know that "Triad" refers to the Greensboro/Winston-Salem/High Point, NC area, you're able to decipher gnboncsg into Greensboro, NC, or that CHA or Charlotte might mean Charlotte, NC (and the Charlotte stuff is about five hops back. And I find the likelihood of someone doing traceroutes to find that information pretty low.

Then again, these guys seem to have compiled a database.