Newbie: in-addr.arpa file for a C Class
Barry Margolin
barmar at alum.mit.edu
Tue Jun 8 20:46:29 UTC 2004
In article <ca4u3m$1eha$1 at sf1.isc.org>, bela at webnet-x.com (belacyrf)
wrote:
> Most likely I'm confusing what the customer is looking for to be
> honest.
> Heres my confusion. In our DNS server for block 216.X.X we have this
> file:
>
> X.X.216.in-addr.arpa. 86400 SOA ns1.myserver.net
> support.myserver.net (
> 2003012918 ; serial
> 3600 ;refresh
> 600 ;retry
> 604800 ;expire
> 86400 ) ;minim
> ;
> ; Nameservers
> ;
> NS ns1.myserver.net.
> NS ns2.myserver.net.
> ;
> ; Other records for this domain (as domain.com).
> ;
> ; example
> ; IN A cus.tom.er.ip
> ; MX 0 mailserver.domain.com
> ;
> ; Host Records (xxx.domain.com)
> ;
> localhost IN A 127.0.0.1
> ;
> ; Momentum Securities Reverse Entries
> ;
> 10 IN PTR mail.domain1.com.
> 11 IN PTR mail.domain2.com.
> 12 IN PTR mail.domain3.com.
> 112 IN PTR machine1.domain4.com.
> 135 IN PTR bigblue.domain5.org.
>
> So obviously if I lookup .10 in this block, I get the associated
> domain. The odd thing is, when I look up an IP that does not have a
> PTR record I get:
>
>
> Name: wsip-216-X-X-9.sub.mydomain.net
> Address: 216.231.10.9
>
> How is that done??
> Thanks again for the help and education.
Since you obviously haven't posted the real zone file, it's impossible
for us to tell.
Also, if you use dig, its output may provide some more clues in the
Authority section.
--
Barry Margolin, barmar at alum.mit.edu
Arlington, MA
*** PLEASE post questions in newsgroups, not directly to me ***
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