Which MAC address is blocked during an Internet lock?

Can I block the MAC address of the router in the apartment, or in a dorm, or is the MAC address of the terminal, laptops or mobile phones blocked?

So as a website owner, can I lock all users who are on a particular router?

Or can I lock only the ENd devices individually?

Now suppose I lock the MAC address that is displayed to me, so the user of my website and the user sits in a career development.

Are then all the people in the vocational promotion, who log in to his wireless login?

You can only block cookies or the IP address which is displayed. The MAC address only knows if the computer and server are hanging in the LAN.