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.rei...@thelounge.net
<mailto:h.rei...@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.rei...@thelounge.net <mailto:h.rei...@thelounge.net>
        <mailto:h.rei...@thelounge.net <mailto:h.rei...@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
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