IPv6 PTR Records

Jay Ford jay-ford at uiowa.edu
Mon Mar 10 16:54:23 UTC 2014

On Mon, 10 Mar 2014, Maechler Philippe wrote:
> How do you manage your IPv6 Reverse Entries?
> Let's assume that we have a /32 IPv6 subnet for our needs and that we only
> publish PTR records where they are needed like for mail servers and maybe
> DNS and web servers.
> Our Network is: 2001:db8::/32
> This would give us a Zone named 8.b.d.
> Our DNS has the ip 2001:db8:193:192::20/64 and the other one has
> 2001:db8:193:193::20/64
> 1) Would you create an entry in 8.b.d. like:
>      IN A  dns1.example.org.
>      IN A  dns2.example.org.

As Chris Buxton pointed out, you lost a few necessary 0s & need "0.2" on the
tail instead of "20".

Provided you get the syntax right, any of those can work.

Choose whatever level of delegation is convenient.  We do most of ours at the 
/64 boundary, but we do some sparse subnets delegated at /56 & such to avoid 
having a bunch of zones with almost nothing in them.

Jay Ford, Network Engineering Group, Information Technology Services
University of Iowa, Iowa City, IA 52242
email: jay-ford at uiowa.edu, phone: 319-335-5555

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