If your desired MAC address is being rejected, change the of your first octet to one of these specific hexadecimal values: x2 (e.g., 02 , 12 , A2 ) x6 (e.g., 06 , D6 , 26 ) xA (e.g., 0A , DA , EA ) xE (e.g., 0E , DE , 2E )
Example: 2C:54:91:88:C9:3E
When manually setting a MAC address for a wireless adapter in Windows, you cannot just pick any random string of 12 hex characters. Microsoft’s NDIS driver specification imposes a rule for wireless cards: If your desired MAC address is being rejected,
This article will explain exactly why this error occurs, the technical role of the first octet in a MAC address, and step-by-step solutions to successfully change your wireless MAC address without encountering this roadblock.
That’s an interesting failure case — and a surprisingly common one for people experimenting with MAC spoofing on Wi-Fi. This error is a common roadblock when trying
This error is a common roadblock when trying to spoof a MAC address on
sudo macchanger -r wlan0
To successfully change your wireless MAC address in Windows, you must set the first octet (the first two characters) to . This is because modern Windows drivers often restrict wireless adapters to Locally Administered Addresses (LAA), which are identified by these specific prefixes. Why the Change Fails