DNS

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 example.com, you can setup name servers with the domains ns1.example.com and ns2.example.com

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.

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