A DNS record type as per RFC 1035.

NS in this context is short for name server. This basic type of DNS record specifies a name server (or a set of name servers) which will have control over the specified domain.

For example:

lamer.foo.com. IN NS ns1.lamer.foo.com.
lamer.foo.com. IN NS ns2.lamer.foo.com.

Would specify that "ns1.lamer.foo.com" and "ns2.lamer.foo.com" are to be contacted for any DNS queries under the domain lamer.foo.com.

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