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.
no
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@srv-rhsoft:/downloads]$ dig -x 91.118.73.6
; <<>> DiG 9.11.32-RedHat-9.11.32-1.fc33 <<>> -x 91.118.73.6
;; 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:
;6.73.118.91.in-addr.arpa. IN PTR
;; ANSWER SECTION:
6.73.118.91.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 85.124.176.242
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
51.75.72.176: 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-boun...@lists.isc.org> on behalf of
techli...@phpcoderusa.com <techli...@phpcoderusa.com>
*Sent:* Saturday, June 19, 2021 1:17 AM
*To:* bind-users@lists.isc.org <bind-users@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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