Change MAC address macOS 12 Monterey

change-mac-address-monterey.md

Change MAC address in macOS Monterey

I was unable to change the MAC address of the Wi-FI device on a MacBook Air (M1 2020) running macOS Monterey due to the following error: ifconfig: ioctl (SIOCAIFADDR): Can't assign requested addres.

By running the commands in following sequence I was able to change it successfully:

1. Turn WiFi device off
2. Turn the WiFi device on again: networksetup -setairportpower en0 on
3. Change the MAC: ifconfig en0 ether <mac-address-here>
4. Run: networksetup -detectnewhardware

THANKS A LOT, THIS REALLY HELP on Macbook Pro(15inch 2019) macOS 13.3 Monterey ！！！！

I get

ifconfig: ioctl (SIOCAIFADDR): permission denied

after step 2

ifconfig: ioctl (SIOCAIFADDR): permission denied

Try sudo before, so sudo ifconfig en0 ether <mac-address-here>
You also have to run that command before it connects to a known wifi network it seems.

it is not working for ethernet adapter

it is not working for ethernet adapter

en0 needs to be replaced with your ethernet port. You can use ifconfig to identify it.

ifconfig: ioctl (SIOCAIFADDR): permission denied

Try sudo before, so sudo ifconfig en0 ether <mac-address-here> You also have to run that command before it connects to a known wifi network it seems.

sudo didn't solve the issue.

FYI I turned this into a script if anyone is interested. https://gist.github.com/mbierman/03b2a962ac04963ef5bbc8354d0ed5d1

It handles Wi-Fi and Ethernet. Not as "fully automated" as I'd like but makes it easier.

it is still not working

ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address

The system does some sort of validation of the MAC address so not all of them will work.
Try the script I made: https://github.com/gchai/macos-mac-address-changer/

I am copping from one adapter to other so it have to be valid

Are they both plugged into the same computer? The OS might prevent collisions.

Plugged first copy mac, unplug second one is in thunderbolt dock and try to set it and it is always no go.

will try with random mac to see if it is working at all

no it is not working with random mac too

Same behavior on my TS3 Plus's ethernet port, maybe the TS3 Plus's chipset does not allow for MAC address changes?

I have tried with 3 different cards which I can change mac under Linux, and they are not working under Macos so problem is in Mac. Probably they have enabled only WiFi spoofing.

one thunderbolt doc, usb ethernet from dell and old TB2 mac ethernet all work under linux and I can change MACs

@phush0 try https://gist.github.com/mbierman/03b2a962ac04963ef5bbc8354d0ed5d1

Sorry for late replay but it is not working even with latest script variant. Also strange enough is that it says that interface is Wi-Fi in self detect. But result is same ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address

edit: tested on the Macpro Wi-Fi script is working for it, but it is not working for ethernet at all

@phush0 if you are referring to the script I posted, let's move the discussion there. If not, please ignore. :)

config: ioctl (SIOCAIFADDR): permission denied what does this mean?