PTR delegation

Scott Haneda talklists at
Wed Jun 3 19:06:16 UTC 2009

On Jun 3, 2009, at 11:53 AM, Scott Haneda wrote:

> Hoping I can get a walk through in simple terms, but also a pointer  
> to some docs where I can dive into the details.  I think I am  
> finding what I want in the docs, but those docs come up 404 since  
> the isc site changed things a bit, from there, I generally can not  
> locate the old doc file.
> 1) Is it possible to determine what ip range/space has been given to  
> user of that IP space?  For example, in a colocation environment, I  
> am given say, a /24, and I want to look that up and see if it really  
> is a /24.  I have found the -x option which is making life a lot  
> easier to find PTR records.
> 2) Given an IP that does not have a PTR, how do I determine if it  
> has been "sub delegated" (?) to the user of that IP?   I need to  
> learn whether or not I need to contact the IP provider, and ask for  
> a PTR record, or if I need to add one in myself.

I was thinking and testing, and I believe I can answer part of my own  
question, but please correct and advise where I am wrong.

Given an ip of
$dig -x 3589	IN	PTR

So I clearly have a PTR, but I want to see who has been delegated  
control of the PTR.
Dropping the trailing 2
$dig NS	3538	IN	NS	3538	IN	NS	3538	IN	NS

This to me looks like in this case is going to control the  
PTR zones?

I can go to and do a lookup there, and find that I have been  
dished out a /26, how do I use dig to get that same answer?

Thanks again.
Scott * If you contact me off list replace talklists@ with scott@ *

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