Does the CC26xx provide a unique MAC number or similar?

Yes, every CC26xx has an unique IEEE MAC address.

How to access it ?

You can use Flash Programmer 2 to read IEEE address.

Ralph,

The TI provided IEEE BLE and 802.15.4 MAC addresses are stored in the FCFG1 (factory config) page of the device found at address 0x50001000.

A full memory map is provided with the TI RTOS installation and is found at <ti_rtos_installation_path>\products\<cc26xxware>/doc/doc_overview.html.

An example of reading out the BLE address is found here:
e2e.ti.com/.../1474237

Note that you can also define your own MAC addresses by editing the customer configuration area (ccfg.c / ccfg_appBLE.c) which will be used instead if set differently than 0xFF..FF.

.:svend