Which of the following hostnames are valid?

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This is from my lecture slides in the web based systems section of Distributed Systems:

Which of the following hostnames are valid?
122.65.132.11.1.97
My_server
300.320.1.32

The answer is: All three can be valid depending on the scheme used.

I would have thought the answer would be that none are valid; can someone explain why all three could be valid?

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DwB On

First: the ip address is the actual name of the host. Everything else is DNS entry that maps to the ip address.

122.65.132.11.1.97 is a valid IPv6 ip address.

My_server is a valid DNS entry (which presumably could map to a legit host).

Corrected: 300.320.1.32 is a not a valid IPV4 ip address.