This is one of those little things that I was always curious about but never asked.
On a Windows DNS Server, you can enable DNS Debug Logging and watch the packets fly by.
A line from that log might look like this:
6/5/2013 10:00:32 AM 0E70 PACKET 00000000033397A0 UDP Rcv 10.161.60.71 5b47 Q [0001 D NOERROR] A (12)somecomputer(6)domain(3)com(0)
The part that I'm interested in is the actual queried name at the end:
What do those numbers that have replaced the periods mean?