Origin of reverse lookup
h.reindl at thelounge.net
Sat Jun 19 10:36:51 UTC 2021
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 184.108.40.206
; <<>> DiG 9.11.32-RedHat-9.11.32-1.fc33 <<>> -x 220.127.116.11
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 21949
;; flags: qr rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 2, ADDITIONAL: 3
;; OPT PSEUDOSECTION:
; EDNS: version: 0, flags:; udp: 1024
; COOKIE: 68fa6f61a7537e2c684ca5d260cdc67126f45c0615547511 (good)
;; QUESTION SECTION:
;18.104.22.168.in-addr.arpa. IN PTR
;; ANSWER SECTION:
22.214.171.124.in-addr.arpa. 7200 IN PTR arrakis.thelounge.net.
;; AUTHORITY SECTION:
73.118.91.in-addr.arpa. 7200 IN NS ns1.thelounge.net.
73.118.91.in-addr.arpa. 7200 IN NS ns2.thelounge.net.
;; ADDITIONAL SECTION:
ns2.thelounge.net. 7200 IN A 91.118.73.
ns1.thelounge.net. 7200 IN A 126.96.36.199
> 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
188.8.131.52: 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
> 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?
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