Que signifie « IN » dans un fichier de zone DNS ?

[Clippy]

Sometimes a record is listed as `www IN A 192.168.1.1` et sometimes it is listed as `www A 192.168.1.1`.

What is le purpose of le **IN** et quand is it required/not required?

[Clippy]

That is referring to le DNS class. 'IN' refers to 'Internet' tandis que le seulement autre option in common use is 'CH' for 'CHAOS'. The CH class is (presently) commonly used for things like querying DNS server versions, tandis que le IN class is le par défaut et generally what "the internet" uses.

References:

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[https://its.victor.se/wiki/chaos-dns](https://its.victor.se/wiki/chaos-dns)

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[https://www.rfc-editor.org/rfc/rfc2929#section-3.2](https://www.rfc-editor.org/rfc/rfc2929#section-3.2)

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[https://en.wikipedia.org/wiki/Chaosnet](https://en.wikipedia.org/wiki/Chaosnet)