Not sure what your asking for.
But the /dev/ names, irregardless of whether or not it's DevFS or just normal devices files have a major and minor device numbers that corrisponds to the hardware device.
Right now they are assigned staticly. Their numbers are coded into the kernel itself. Eventually they will be assigned dynamicly, but that's not for a long time from now.
Also DevFS has depreciated in the 2.6 kernel. It's going to be replaced by the userland uDev combined with the /sys directory.
You can find a listing of Major/Minor device numbers by looking at the documentation aviable in your kernel source tree. It's in Documentation/devices.txt