[nwf]

Unfortunately, the technology you need to do that is not yet finished: https://trac.torproject.org/projects/tor/ticket/9498

ETA: I should have said "one possible technology"; there may be others, but I am pretty sure that an IP-less Tor node requires that you play the Tor Bridge game and stream the Tor protocol over a non-IP link. I have had a prototype of this design running, but have yet to have it to a point I consider robust.

[icebraining]

praptak didn't say IP-less, but no public IP. If the server has an IP in the 192.168.1.X range, that doesn't tell an attacker much, supposedly.

[nickodell]

This looks like it's unrelated.