My Reverse Look Up suddenly stopped working for most servers

[Reindl Harald]

frankly - one last time, otherwise don't expect any future answers - if 
you get a response on the mailing list then sned your answer to the 
mailing list and *not* to the individual which responded

Am 08.02.2017 um 17:46 schrieb Majid Chavoshi:
> I understand, I am the Unix/Linux SysAdmin down stream, I'm just trying
> to be helpful to our DNS Admin up stream. I don't even have access to
> our DNS servers; thanks so much for your help.

you don't need access to the dns servers for using dig/whois/nslookup

jesus just mention the IP's in question, what PTR answer you expect and 
the full input and output when doing that lookup

you said "but the reverse look up suddenly stopped working for most 
servers" in your initial post - so you must have entered some command 
leading to that conclusion - so why don't you copy&paste the input and 
output of that command in your opening post?

> On Wed, Feb 8, 2017 at 10:42 AM, Reindl Harald <h.reindl at thelounge.net
> <mailto:h.reindl at thelounge.net>> wrote:
>
>     don't reply off-list on mailing-lists!
>
>     Am 08.02.2017 um 17:37 schrieb Majid Chavoshi:
>
>         Hey reindl,
>
>         Thanks so much for your reply. How would I find out if I own it
>         or not?
>         Sorry, but I'm kind of new at this; thanks.
>
>
>     if you would have told the nameserver and sample ip's everybody
>     already could take a look, but you didn't provide *any* informations
>     in two mails but aksing for help - help us to help you
>
>     you should know such basics about your enviroment!
>
>     how many ip-adresses do you have?
>     ISP's typically don#t delegate (if at all) if you don't have at
>     least a /24 for your own
>
>         On Wed, Feb 8, 2017 at 10:32 AM, Reindl Harald
>         <h.reindl at thelounge.net <mailto:h.reindl at thelounge.net>
>         <mailto:h.reindl at thelounge.net <mailto:h.reindl at thelounge.net>>>
>         wrote:
>
>
>
>             Am 08.02.2017 um 17:26 schrieb Majid Chavoshi:
>
>                 My DNS was working find, but the reverse look up
>         suddenly stopped
>                 working for most servers (it still works for a few
>         servers, I'd
>                 say it
>                 still works for 20% of servers). Where can I look? What to
>                 restart? What
>                 should I do? Thanks
>
>
>             you don't provide much informations
>
>             are you sure *your* server is responsible for the PTR zone
>         at all?
>             for most people it is not because it belongs to the ISP