You can specify a custom mask/format for your Network's Serial Number.
To create your format, use the characters defined below.
Fa-f and digits that range from 0-9Pa-z, 0-9)00-9)Aa-z)To create a serial number that allows only digits, use the following format: 0000.
This allows 4 digits in the serial number.
0000
To use 16 characters in your serial number, allowing characters that range from a-f and digits that range from 0-9, use the following format:
FF-FF-FF-FF-FF-FF-FF-FF
This would allow combinations like:
08-86-AB-56-82-6C-F2-EE