Why do I have in my Active Directory Integrated DNS for each Name Server 2 entries ?

Question

Hello, can someone explain me, why I have in my AD-DNS for each nameserver 2 entries? One with the host all lower letter and the second entry with the nameserver hostname all in capital letters? Everything else data is the same.
This is also true for the Kerberos and ldap entries.
Is this a mistake?
ChatGPT meant this is due to stay compatible. Older system needed one kind and modern system the other.
But when I ask Bing, I get the answer that's a mistake and i should delete the copies, because DNS is letter insensitive.
I think Bing is right, 'cause the Host entries are also all only one. But I want to be sure AND I would love to get an explanation.
THX and gretz from Vienna,
Peter

Answer 1

Hello

Thank you for your question and reaching out.

This behavior occurs because of a change in how the Windows Server DNS functionality manages the RDATA segment of an SRV record. In Windows Server 2012 R2 and earlier versions, the RDATA segment contains only lowercase letters. If a computer name contains uppercase letters, the DNS functionality converts them to lowercase. However, the Windows Server 2016 (or later version) DNS functionality accepts uppercase and lowercase letters.

Reference:

https://learn.microsoft.com/en-us/troubleshoot/windows-server/networking/dns-registers-duplicate-srv-records-for-dc

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