Use for questions about PTR (Pointer) records used to resolve IP addresses into host names (reverse DNS lookup).
Questions tagged [dns.ptr]
8 questions
1
vote
1 answer
How to find all IP having a PTR-DNS-Entry for a domain
How to get a list of all IP having a PTR-record for a particular domain, e.g. mail.example.com
Goal is to have a list of IP that
x.y.z.a
x.y.z.b
x.y.z.c
are claiming to serv mail.example.com.
frlan
- 746
0
votes
1 answer
Automatic PTR-records for computers on a windows domain?
Computers connected to a windows domain are accessable through computerName.domain.tld
Is there a way to automatically add PTR-records to these on a local AD-integrated DNS-server?
If not: why?
Drathier
- 1,462
0
votes
1 answer
DNS PTR record for CNAME
I'm in the process to script my dns server to auto generate PTR record and zones according the the non reversed one.
However, I wonder if it make sense/is legal to add PTR record for all the CNAME records in addition to the A records.
In my mind it…
Remy Grandin
- 105
0
votes
1 answer
antispam PTR checks against what domain
PTR checks the domain IP address to validate sender address.
But against what? the SMTP HELO hostname?
Or against email domain?
for example if I send an email from john@domain1.com from a SMTP server with domain domain2.com
Is PTR check performed…
Ariyan
- 625
0
votes
1 answer
BIND create reverse zone for /21 block
LINUX, BIND9
I have a network which sits in /21 block and would like to make a reverse zone, I would like some guidance to know where to look to create the reverse zone file.
I could make seperate files for each of the 3rd octet block, example:…
Khorem
- 1
0
votes
1 answer
A record to a sever Ip not working
Good day
I use a conventional Host service for my WordPress website, say example.com.
I also have deployed a flask web application on a server, say its IP is 1.1.1.1.
I want to create an "A Record" on my domain , say app.example.com, which points…
Dr Simon
- 1
0
votes
1 answer
How do I get a PTR record for an MX that points to a different IP than the A record does?
MXToolbox indicates a warning that my smtp server's header banner fails to match reverse lookup for the stated domain.
This makes sense - I've got a domain with the MX set to one IP (my mail server), but the A record is set to the web host.
Is it…
Mordachai
- 143
0
votes
2 answers
What limitations and risks regarding assigning multiple domain names (PTR) for single IP
For my exchange i need to create PTR record for many domains and assign it to single IP.
like :
mail.x.com assign to 51.51.51.51
mail.y.com assign to 51.51.51.51
mail.z.com assign to 51.51.51.51
I request that to ISP but i ask and need confirm…
