ayi <p>Sometimes a record is listed as <code>www IN A 192.168.1.1</code> and sometimes it is listed as <code>www A 192.168.1.1</code>.</p> <p>What is the purpose of the <strong>IN</strong> and when is it required/not required?</p>
ayi_2 <p>That is referring to the DNS class. ‘IN’ refers to ‘Internet’ while the only other option in common use is ‘CH’ for ‘CHAOS’. The CH class is (presently) commonly used for things like querying DNS server versions, while the IN class is the default and generally what “the internet” uses.</p> <p>References:</p> <ul> <li></li> </ul> <p><a href="https://its.victor.se/wiki/chaos-dns">https://its.victor.se/wiki/chaos-dns</a></p> <ul> <li></li> </ul> <p><a href="https://www.rfc-editor.org/rfc/rfc2929#section-3.2">https://www.rfc-editor.org/rfc/rfc2929#section-3.2</a></p> <ul> <li></li> </ul> <p><a href="https://en.wikipedia.org/wiki/Chaosnet">https://en.wikipedia.org/wiki/Chaosnet</a></p>
