NOTE: Looks like Apple killed tis in Sonoma. There may be no viable workaround. If I find one, I will update this script. This allows you to create and assign any MAC address you like for macOS Wi-Fi or Ethernet connections. If you don’t supply one a random mac will be created for you.

randommac.sh

#!/bin/bash

# v 1.0.2
# https://gist.github.com/mbierman/03b2a962ac04963ef5bbc8354d0ed5d1
# 2022 mbierman

sleep="${1:-5}"
regex="^([0-9A-F]{2}[:]){5}([0-9A-F]{2})$"
getmac () {
	rnd=$(openssl rand -hex 6 | sed 's/\(..\)\(..\)\(..\)\(..\)\(..\)\(..\)/\1:\2:\3:\4:\5:\6/')
	echo -e  "What is the mac address want to set the mac\n\nexample: CA:49:63:9F:78:27\n\nLeave blank to get one generated for you."
	read tmp
	mac1=${tmp:=$rnd}

	mac=$(echo $mac1 | tr '[:lower:]' '[:upper:]')
	
	if [[ $mac =~ $regex ]] ; then
		comp=true
		echo -e "\n\n Using $mac...\n"
	else
		comp=false
		echo false	
	fi 
}

until [ "$comp" = "true" ]
do
	getmac
done

getAdapter () {
echo "What is the adapter you want to set the mac for [en0,en1, etc. use 'ifconfig' if you don't know]"
read adapter
}
until [ "$adapter" ] 
do
	getAdapter
done

type=$(ifconfig $adapter | grep baseT)
if [ "$type" ]; then
	echo "got Ethernet"
	type="Ethernet"
else
	echo "got Wi-Fi"
	type="Wi-Fi"
fi

read -p "Is $adapter $type (y|n) ? " -n 1 -r
if [[ ! $REPLY =~ ^[Yy]$ ]];  then
	echo "Exiting. Run again"
	exit
fi 

sudo ifconfig $adapter down && sleep $sleep  && sudo ifconfig $adapter up && \
sudo ifconfig $adapter ether $mac && sudo networksetup -detectnewhardware

It's not woking on MACOS sonoma 14.4.1 (23E224), MacBook Air, Apple M1.
It showed the error message: "ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address"

This script doesn't work for some people because when it runs "sudo ifconfig $adapter up", it auto-associates with a known SSID if a known SSID is found. The wifi adapter needs to be on and not associated for it to work. That's why the following step works, "disconnect from wifi network (do not turn off wifi adapter)".

I don’t quite follow. Can you explain what you mean?

It's not woking on MACOS sonoma 14.4.1 (23E224), MacBook Air, Apple M1. It showed the error message: "ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address"

What is the interface of your Wi-Fi adapter?

The Wifi Device's information is as below: (Attached next reply) When I used the ifconfig to change the MAC address, it got the error message. (Attached next reply) Michael Bierman ***@***.***> 於 2024年5月13日 週一 上午5:24寫道：

…

***@***.**** commented on this gist. ------------------------------ It's not woking on MACOS sonoma 14.4.1 (23E224), MacBook Air, Apple M1. It showed the error message: "ifconfig: ioctl (SIOCAIFADDR): Can't assign requested address" What is the interface of your Wi-Fi adapter? — Reply to this email directly, view it on GitHub <https://gist.github.com/mbierman/03b2a962ac04963ef5bbc8354d0ed5d1#gistcomment-5054576> or unsubscribe <https://github.com/notifications/unsubscribe-auth/AC24BFPNFJ3LVTA6H4MTZ4DZB7MZDBFKMF2HI4TJMJ2XIZLTSKBKK5TBNR2WLJDUOJ2WLJDOMFWWLO3UNBZGKYLEL5YGC4TUNFRWS4DBNZ2F6YLDORUXM2LUPGBKK5TBNR2WLJDHNFZXJJDOMFWWLK3UNBZGKYLEL52HS4DFVRZXKYTKMVRXIX3UPFYGLK2HNFZXIQ3PNVWWK3TUUZ2G64DJMNZZDAVEOR4XAZNEM5UXG5FFOZQWY5LFVEYTCOBQGE4TKNRSU52HE2LHM5SXFJTDOJSWC5DF> . You are receiving this email because you commented on the thread. Triage notifications on the go with GitHub Mobile for iOS <https://apps.apple.com/app/apple-store/id1477376905?ct=notification-email&mt=8&pt=524675> or Android <https://play.google.com/store/apps/details?id=com.github.android&referrer=utm_campaign%3Dnotification-email%26utm_medium%3Demail%26utm_source%3Dgithub> .

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Attached the screenshots:

Looks like Apple killed this in Sonoma. There may be no practical workaround. If I find one, I'll update.