Why can't I spoof my wifi card's mac address to 1F:2E:3D:4C:5B:6A. Is that address invalid?
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Your first Byte 0x1F in binary is 0001 1111.
Since the bit.0 in the first byte of your MAC address is set to 1, the address corresponds to a multicast address, please see e.g. Wikipedia.
In order to have a valid unicast address, you should always have bit.0 set to 0, which in your case could be achieved, e.g. by changing the MAC address to
1E:2E:3D:4C:5B:6A, because 0x1E is equal to 0001 1110.
