Every Toradex module has a unique Serial Number.
You can find the Serial Number on the bar code sticker on the module.
There are different versions of these stickers some of them have a 1-D bar code and some have a 2-D bar code.
It is possible to read the serial number from userspace.
For all modules, the serial is available in
cat /proc/cpuinfo | grep Serial# orcat /proc/cpuinfo | grep Serial | cut -d ':' -f2
For device-tree enabled modules, the serial number is available in
The SysinfoLib, which is part of our free Toradex CE Libraries contains functions to query the serial number.