Question [Q] Accidentally deleted .macaddr file

I was trying to spoof my MAC address permanently, so I followed instructions from some guys suggested at the Nexus 4 forum. I was able to edit the file (/persist/wifi/.macaddr) via Terminal and it worked.
I accidentally deleted that file a couple of days after that trying to set another MAC address. I still got internet connection and I got a new MAC.
The problem is that I want to change that MAC but I can't since the .macaddr is nowhere to be found and I don't know from where does it get the new MAC address.

Any advice?