Can authoritative name servers have the same domain name for which they are authoritative of?

Yes.  In fact, many web hosts offer what is called "private name servers" which allow you to use your own domain for your name servers.

For example, if your website is, you can setup name servers with the domains and

When you register them, each are associated with a particular IP address, which sometimes is the same as your web hosts's name server IP addresses.

For example, your web host's name servers and may be associated with IP addresses and respectively.  When you register your name servers and, your web host may tell you to associate them with the same IP addresses and, which in a sense, makes them an alias of your web host's name servers.

If you have your own dedicated server or a different setup, your private name servers and might have their own unique IP addresses instead.

So it is possible, and widely used.

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