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Xsmael
Asked: 2024-10-08 06:04:20 +0800 CST

What do I need to configure reverse DNS?

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I've set up PTR record on the DNS server of our organisation. Reverse lookup works on our network, but from a different network, it does not work.

It seems to me that something needs to be done on the regional Internet registry RIR's side.

I have no idea how to get in touch with them and then why would they do what I want?

Can I just configure PTR records and if I did it correctly it will just work?

Do I need the RIR to do something?

Is it how everyone is doing it?

PS: i'm comfortable with DNS but reverse DNS is kind of confusing to me for now (I'm new to it).

domain-name-system

1 Answers

  1. Best Answer

    Reverse DNS is essentially the same as DNS. In case of a normal domain, say example.org, the registrar of .org will reply that example.org is handled by your DNS server.

    With reverse DNS, it's the same. A reverse record (for IPv4) looks like 1.0.18.198.in-addr.arpa.. The reason why it's reversed, is to allow subnetting. The root servers will in this case have a pointer to 198.in-addr.arpa.. The NS for 198.in-addr.arpa. may further delegate 18.198.in-addr.arpa to someone else.

    The result of this is that the owner of the block is delegated access. There's mechanisms to delegate subnets not aligned to octet boundaries. But in short; you need to work with your ISP.

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