Origin of reverse lookup

alcol alcol alcol at hotmail.com
Sat Jun 19 11:24:47 UTC 2021

I see you have time to waste saying strange things

dns zones even forard or reverse are downloaded as configured from masters to slaves or where are needed

all other remarks are confirmations of what said

I see u have time to waste ................ is clear 🤔😄

thanks to have said same things as mine

From: bind-users <bind-users-bounces at lists.isc.org> on behalf of Reindl Harald <h.reindl at thelounge.net>
Sent: Saturday, June 19, 2021 12:36 PM
To: bind-users at lists.isc.org <bind-users at lists.isc.org>
Subject: Re: Origin of reverse lookup

Am 19.06.21 um 12:10 schrieb alcol alcol:
> ISP Have is a normale DNS zone as forward ones
> they does not offer remote mainteining as you should own all subnet
> class and are directly downloaded from iana if I remember well.

ptr zones are the same way delegated as any other zones

> if something go wrong with the zone ISP will have issue from tld.


> in past I had a master reverse lookup maintained from me downloaded from
> isp becous iana can't go around the world to download and to avoid
> issues in download.

dns zones are not downloaded

> as are zones with so few changes isp could allow something like a
> cpannel to change some records.

that don't scale given that most customers just have a single IP

in case you have a /24 the ISP can delegate the whole zone to you, look
at the authoritative nameservers below

[harry at srv-rhsoft:/downloads]$ dig -x

; <<>> DiG 9.11.32-RedHat-9.11.32-1.fc33 <<>> -x
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21949
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3

; EDNS: version: 0, flags:; udp: 1024
; COOKIE: 68fa6f61a7537e2c684ca5d260cdc67126f45c0615547511 (good)
;      IN      PTR

;; ANSWER SECTION: 7200  IN      PTR     arrakis.thelounge.net.

73.118.91.in-addr.arpa. 7200    IN      NS      ns1.thelounge.net.
73.118.91.in-addr.arpa. 7200    IN      NS      ns2.thelounge.net.

ns2.thelounge.net.      7200    IN      A       91.118.73.
ns1.thelounge.net.      7200    IN      A

> usually reverse lookup are resolved with a standard naming with ip and
> isp name

for consumer ranges: yes

> if you run a mail server could be usefull

if you run a mailserver it is a must, at least when you care to deliver
your mails, as well make sure your HELO-hostname matches too

many sites add at least points to the sapm scoring for clients like that:

warning: hostname szkoleniagospodarka.pl does not resolve to address Name or service not known

> if not a reverse lookup is not
> so much used

well, in case of servers i prefer PTR/A matching no matter if it is
supposed to send mail and the same goes for internal networks i maintain

> ------------------------------------------------------------------------
> *From:* bind-users <bind-users-bounces at lists.isc.org> on behalf of
> techlists at phpcoderusa.com <techlists at phpcoderusa.com>
> *Sent:* Saturday, June 19, 2021 1:17 AM
> *To:* bind-users at lists.isc.org <bind-users at lists.isc.org>
> *Subject:* Origin of reverse lookup
> Hi,
> I had my ISP configure a reverse lookup years ago.  They say they no
> longer offer that service and there is no reverse lookup for my IP.
> I keep running into this old reverse lookup and do not know where it is
> coming from.
> When I run https://intodns.com/ <https://intodns.com/> it shows this
> reverse lookup and not the
> one I just configured on my local box.
> Any thoughts on how I might resolve this or find who is hosting this
> reverse lookup?
> Thanks!!
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