The Major and Minor numbers are fixed and standard numbers. It is standardized and maintained by The Linux Assigned Names And Numbers Authority (LANANA) and it is a part of Free Standards Group. Regardless which distro it is, these major and minor numbers remain same. New devices can be registered through LANANA.
It is important to know the numbers, it is available in linux documentation. (Documentation/devices.txt)
You may not have this doc installed, so here goes an online link of the latest doc.
Current Linux 2.6+ Device List (Updated 24 July 2007)
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