Right-click on an empty space in the right pane, select , and name it NetworkAddress .
: Right-click the Start button and select Device Manager .
If you use a random digit (like 00 or 11 ), the network driver or the OS will often reject it, resulting in the "Failed to change" error. Why the First Octet Matters The first octet of a MAC address contains two crucial bits: Right-click on an empty space in the right
Replace <interface> with the name of your network interface (e.g., wlan0 or en0 ) and <new_mac> with the new MAC address.
The requirement to use a locally administered address (LAA) prevents random MAC addresses from clashing with manufacturer-assigned, globally unique ones on the same network. For 99% of users facing this issue, the simplest and most effective path forward is to . Why the First Octet Matters The first octet
Knowing the rule, you have three main paths to a solution. Your choice will depend on how important it is for you to use your exact, specific MAC address versus any valid one.
This method works when the Network Address option is hidden in Device Manager. Knowing the rule, you have three main paths to a solution
Remember to ensure the first octet works by using 2 , 6 , A , or E as the second character (e.g., 16AABBCCDDEE ).
(where x is any hex digit) will typically bypass this restriction. Stack Overflow Quick Fixes If you are using a tool like Technitium MAC Address Changer or the Windows Registry, try these steps: