mac address doesn't end in numbers

[fatjack]

My router mac addresses end with a letter and number or number and letter. Which do I change?

[ilcarletto]

Hi,
you just have to change it... doesn't matter if numbers of letters

Googling around the web I found this:

"A MAC address is an essentially unique number associated with a network card in a machine; it serves as a convenient way to distinguish between two different computers. A MAC address consists of 48 bits, usually represented as a string of 12 hexadecimal digits (0 to 9, a to f, or A to F); these are often grouped into pairs separated by colons or dashes. For example, the MAC address 001B638445E6 may be given as 00:1b:63:84:45:e6 or as 00-1B-63-84-45-E6."