Originally Posted by tmybpv

Hello, there are numerous of questions on the internet that go like this:

Q: Can a website identify or ban me by my MAC address?
A: No, of course websites can't see your computer MAC address (...mumbling something about an identifiable modem MAC address, while closing the topic)

In other words, could I sign up for an account which has a 1 account policy, after I once had an account there ages ago? While using the same modem, but a different IP address.
Asking for a friend of course.

Could someone please explain?

As per the http(s) protocol, MAC address is not part of the request. So website won't know your machine MAC. And if the website is sniffing packets, then it should normally be able to find only the MAC of the last hop. But ofcourse, you never know the level of technologies these days.