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Typical DNS zone files contain records like this:

something   IN      A               1.2.3.4
xxxxx       IN      A               2.3.4.5
kkkkk       IN      A               8.2.1.2

What is the IN for? And why it works even if it's not there?

P.S. yes I did google this, but believe or not googling "in" is not fun.

Petr
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  • The very first Google search result for "DNS IN" links to an identical question on server fault with an answer. Did you *really* bother to search first? https://www.google.co.uk/search?q=dns+IN https://serverfault.com/questions/220775/what-does-the-in-mean-in-a-zone-file – Steve365 Nov 04 '17 at 11:35

1 Answers1

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The field record class indicates the namespace of the record information. The most commonly used namespace is that of the Internet, indicated by parameter IN, but others exist and are in use, e.g., CHAOS.

source

Ignacio Vazquez-Abrams
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