I'd like to be able to use a MAC address in the client group management UI rather than IP addresses.
A machine can have multiple IPv4 addresses and I don't really want to have to block each one if I don't have to. It would be much better if we could just block on the MAC and have the pi-hole worry about which address needs to be blocked.
This has already been requested, and it's currently actively researched in development (no guarantees on when and if that will be released yet, though).
Please consider searching our forums before you submit a new Feature Request. By upvoting and/or extending an existing FR, you will also raise the chances for it to be considered by the dev team.
Closing this as duplicate of Provide MAC address as option for Per-client blocking