Alias Header.AA

Authoritative Answer

struct Header
{
  // ...
  alias AA = mix_AA.getset;
  // ...
}

This bit is valid in responses, and specifies that the responding name server is an authority for the domain name in question section.

Note that the contents of the answer section may have multiple owner names because of aliases. The AA bit corresponds to the name which matches the query name, or the first owner name in the answer section.