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Quelle est la signification de « @ » dans un fichier de zone DNS ?

ayi

I have the following data in my DNS zone file for my domain:
<pre><code class="lang-auto">$ORIGIN mydomain.com.
@ IN A 208.X.Y.Z
mail IN A 208.X.Y.Z
... etc..

</code></pre>
What does the <code>@</code> line mean? I know what an A record is.. but a host with an ampersand <a href="http://en.wikipedia.org/wiki/@" rel="noopener nofollow ugc">at sign</a>?

ayi_2

<a href="https://datatracker.ietf.org/doc/html/rfc1035">RFC 1035</a> defines the format of a DNS zone file.
… on <a href="https://datatracker.ietf.org/doc/html/rfc1035#page-35">page 35</a> you’ll find:
<blockquote></blockquote>
@ A free standing @ is 
used to denote the current origin.
This means that <code>@</code> is a shortcut for the name defined with <code>$ORIGIN</code>.
You can find more information on <code>$ORIGIN</code> <a href="https://serverfault.com/questions/879913/dns-origin-dot">here</a>, which is an excerpt from Pro DNS and BIND, published by Apress.