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Questions tagged [ptr-record]

PTR is a type of record in DNS system used for reverse DNS lookups (IP address to hostname)

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Scrape subdomain IPs using PTR records

I'm looking for a solution to an obscure problem. For security policy reasons we have a workstation using PeerBlock with a block list that essentially blacklists the entire internet, and then an allow ...
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2answers
374 views

domain name system - rDNS is not exist [closed]

I need some help with Reverse DNS as I have got a problem with it. I have setup rDNS on my hosting provider which I use rdns1.example.com and I have a server hostname which it is gateway1.example.com. ...
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0answers
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Postfix myhostname attribute and rDNS

I run a mailserver on Ubuntu using Postfix to serve a domain I have. Let's call it domain.com. For this domain, I have the follow DNS records: A domain.com 1.2.3.4 A mail.domain.com 1.2.3.4 MX ...
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1answer
49 views

Setting up a global PTR record for entire server

Digital Ocean droplet running CentOS 7 with Plesk Panel installed. Trying to improve the email deliverability and overall state of the mail server. Want to set up a PTR record and apply this to the ...
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1answer
104 views

Reverse DNS PTR entries matching to MX entries

Confusion over what reverse DNS applies to and where it gets set... Although there are answers on how to do this, I still cannot determine what needs to get done and why. A domain is registered at ...
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2answers
36 views

Different PTR record resolve in DNS my DNS server and the public DNS server

I have created a PTR Record for Mail matters on my DNS server which can be seen as public. But after a day it is not recognized by mxtoolbox.com. I have checked every possible syntax errors but there ...
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2answers
203 views

Google Cloud Compute Enable PTR Record - Invalid value for field 'resource.publicPtrDomainName

I have followed the proceedure in google cloud documentation...https://cloud.google.com/compute/docs/instances/create-ptr-record verify domain ownership (done and verified) in google cloud console, ...
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2answers
1k views

Windows AD DNS is automatically adding PTR records for CNAMEs and I want this to stop

Preface: I am not a Windows admin. I am a Linux admin. I have a Windows 2016 server with AD DNS that handles internal DNS forward and reverse lookups. Somewhere, somehow, some process is ...
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1answer
517 views

Entering multiple DNS TXT values as a single TXT entry, with each value in " marks, but separated by spaces

I have done this with other DNS providers but I'm stuck on UltraDNS's DNS management interface. I need to enter multiple values in a TXT entry so they resolve as a single string with each value in " ...
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2answers
235 views

Single DNS and E-Mail server with multiple public IP addresses

On our site we have two internet providers, with public IPs on each link. We manage locally our DNS and SMTP server. We want to publish our DNS and SMTP server on both links, to get redundancy. My ...
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1answer
49 views

Which domain should the IP PTR record resolve to?

I am trying to set up a mailserver alongside my webserver, example.com, at IP address 192.0.2.1 I have installed the usual suspects; Postfix, Dovecot, Roundcube, ClamAV milter, and OpenDKIM. I ...
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1answer
158 views

Google cloud load balancing and reverse DNS

I have a domain example.com pointing at a Google Cloud load balancer. Requests get served by one of several Compute Engines behind the load balancer. The load balancer ip is 1.2.3.4 Now when I send ...
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2answers
33 views

Setting up email server SPF without access to IP PTR

What is or is there a proper way to set up SPF without setting the IP's PTR? because I don't have access and want to know if there's an alternative method
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1answer
86 views

new email send to Outlook.com never deliver but reply on Outlook.com email does

I dont know where i could start. There is the probleme. If someone send me an email from Outlook.com, i received the email. If i reply, he will received my email. If i write a new email and send it ...
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1answer
439 views

How delegate the reverse DNS lookup to another name server?

Consider this scenario: A VPS server with one ip address (1.2.3.4) running "bind name server" to resolve requests. An organization which gave that ip address to the VPS server. Obviously the ...
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1answer
71 views

Multi-view DNS PTR issues

I am seeing some problems with PTR zone resolution, and I can't quite figure out what is not configured correctly. Summary: 1) I've been delegated authority for my PTR zone (246.237.204.in-addr.arpa,...
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1answer
111 views

bind9 on server locally for mail ptr record with cloudflare as name servers

I am using cloudflare's name servers for example.com with a cname for www - these are filtered through cloudflare. In cloudflare, I have an mx record pointing to mail.example.com and a mail A record ...
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3answers
992 views

How to know if reverse PTR record is correct for emailing purposes

I send emails for test@example.com with my own server. When using dig -x xxx.xxx.xxx.xxx with the IP of my server, I get: ;; QUESTION SECTION: ;xxx.xxx.xxx.xxx.in-addr.arpa. IN PTR ;; ...
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1answer
433 views

Reverse PTR record lookup not working with dig

As mentioned here, having a Reverse PTR record is key for successful email sending and delivery from one's own server. In order to check if it's correctly set for my server, I tried: dig -x 111.111....
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1answer
256 views

BIND9 can't resolve in-addr arpa

I am trying to configure my nameservers to resolve a PTR zone for which we are authoritative. I have several forward zones that work just fine, but when I try to resolve a PTR, the result does not ...
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1answer
175 views

PTR record won`t update

Currently, my server is running Ubuntu Server. I had the domain "rosresurs.msk.ru". A bit later I've bought a new domain called "rosresurs.net". But when I ran dig command, I saw, that old domain is ...
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1answer
44 views

How to allow rDNS(PTR) record to point a specific domain?

Maybe it sounds too complicated, but I will do my best to explain. The problem is the following: some domain is pointing my servers IP address. How can I block that rDNS (PTR) record, so I can attach ...
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1answer
72 views

Delegating reverse dns records - Bind (Ubuntu Server)

I have got a mail server attached to a static provided by my ISP. Our dns service is run by buddyns DNS service because our ISP blocked 53 by default. The DNS service is excellent, but i dont know how ...
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2answers
365 views

BIND DNS: how to override RR generated by $GENERATE directive?

I'm running an authoritative nameserver for a reverse /16 zone, where every IP is mapped to a custom subdomain. This is achieved by a zone file with 256 $GENERATE directives, for example (subnet 11.22....
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1answer
223 views

How to set reverse ptr in azure Cli?

I'm trying to add reverse ptr on my Azure VM server. I tried via powershell and now I'm trying CLI direct on Azure panel. NOTE: My VMs are static ip. az network public-ip update --resource-group ...
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1answer
189 views

how to properly configure DNS when server hosting one domain is sending mail from another?

i'm trying to figure out how to properly setup TXT and PTR records in the following case: - one domain is hosted on the server 1stdomain.com on IP 1.2.3.4 - it uses remote mail server for sending ...
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1answer
320 views

can not having a PTR record affect website performance?

I moved my ptr from my maindomain.com to my mail.maindomain.com. Now i could swear my website was faster before, but i can't prove it. Could not having a PTR record affect performance in any way? ...
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1answer
70 views

PTR lookup to authenticate emails

gmx.com and mail.com are using PTR lookup to authenticate emails. For example, I used 1.1.1.1 to send email as from gmail.com to gmx.com, gmx.com would do PTR look up for 1.1.1.1 see if its gmail.com. ...
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1answer
2k views

Reverse DNS for multiple IP address with same domain name

We have a setup where our day-to-day email is sent via GSuite for Business and our bulk email (newsletters, etc) are sent through an Exchange server (to avoid Google's sending limits). Both are sent ...
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1answer
811 views

Receiving mail from Gmail delayed - PTR issue?

One of our partners receives our mails with noticeable delays. The same mail sent to two addresses under their domain are sometimes delivered at their server hours apart (checked in the actual server ...
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2answers
58 views

Possibility to synthesise resource records in BIND?

is there possibility to synthesise resource records in BIND, similar as in KnotDNS with following command? synth_record "(forward`|reverse) <prefix> <ttl> \<address>/<nn>";` ...
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1answer
363 views

How to Add Pointer Record in Reverse Lookup DNS Zone (Windows Server)

I want to add a pointer record in reverse lookup zone in windows 2012 Server. The pointer record should point to a delegated zone defined in a forward lookup zone. I want to answer any DNS query: b....
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1answer
4k views

Why does SSH report “reverse mapping checking getaddrinfo failed” even when PTR record is set?

I'm trying to setup a cluster using a private network on subnet 10. One machine has two interfaces, one to connect to the regular network and the other to connect to all the nodes on subnet 10. This ...
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2answers
910 views

Is PTR record needed if SPF record points to IP

If sending email as user@mydomain.com from mail server 1.2.3.4, and the SPF record of mydomain.com set as "v=spf1 ip4:1.2.3.4 -all" Will a PTR record do any good? Is PTR required for some e-mail ...
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1answer
342 views

Allow mail to be sent from any subdomain (PTR, SPF, Gmail)

I use a single smarthost as a hub to route all email from my network so that I can pass SPF checks on Gmail. However, although I always send through the same server, the From address can differ. For ...
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4answers
12k views

Reverse DNS Setup for an IP with multiple domains

I am trying to clarify my Reverse DNS PTR lookup for a domain. I have a server with a single IP addresses and multiple accounts, all sharing that IP address; My PTR is currently: 24.210.31.in-addr....
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4answers
177 views

How do I create a PTR record for my server?

I assumed I would set up a PTR record with my other DNS records, but have been told by my hosting company that "a PTR record should be set up at the side of your server, not as a DNS record in your ...
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1answer
226 views

SERVFAIL after PTR configuration attempt (BIND 9)

I'm having trouble with setting up reverse DNS. I own the mentioned public IP addresses. After making changes to named.conf (added zone "1.198.193.in-addr.arpa" ) options { directory "/var/...
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2answers
1k views

Configuring reverse DNS on BIND 9.7.3

I'm seeing the following in /var/log/mail.log UPDATE :I own the mentioned public IP addresses. The IP address sending this message does not have a PTR 550-5.7.1 record setup. As a policy, Gmail does ...
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1answer
284 views

Configuring DNS Server on Windows 2012 R2

I am a newbie at Windows Server Management and am trying to host a website on my Windows 2012 VPS I have installed IIS, added the site and the site is up and running. The domain is from GoDaddy and I ...
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1answer
94 views

Is it ever preferable to have a server without a DNS PTR record? [closed]

Other questions on this site explain why it's helpful to have a PTR record, and why it's unhelpful to have multiple of them. Are there any real-world situations where a server with one or more A ...
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1answer
760 views

How to create RDNS (Reverse DNS) [closed]

How to create a RDNS (Reverse DNS) in centos or Ubuntu [PTR record] I searched a lot in Internet and didn't find any solutions. I got a idea it can be done by BIND or BIND9. In some forum i seen ...
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2answers
150 views

Multiple Domains on one Server IP-Adress

i need some help. I would like to host my own Mailserver with two or more domains. But to dont get blocked on outlook.com for example. I need a PTR to every Mail-Domain to get a correct lookup. Can i ...
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0answers
44 views

FCrDNS for a mail server that also runs other services (http, ftp etc)

I am learning how to administer productive internet-facing machines and services, and towards that end setting up mail, web, and a couple other services, all on the same box (budget constraints and ...
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1answer
5k views

No PTR record according to gmail

Recently, I installed iredmail on my VPS and configured DNS records (including ptr). It confirms nslookup: nslookup zelenin.top Name: zelenin.top Address: 191.101.251.182 nslookup -query=mx ...
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1answer
534 views

Best practices for managing the IP addresses you own in DNS and their PTRs?

I was wondering how exactly the big companies go about managing all the IP addresses that their public servers use, especially in respect to setting up correct PTR-records. This is very important, ...
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1answer
1k views

PTR record format for IPv6

What is the difference in the following two IPv6 PTR formats? 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0 IN PTR smtp.example.com. 4.3.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0.0.a.4.f.7.0.6....
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1answer
251 views

Configuring rDNS and PTR Record [duplicate]

I know that here was a few questions about it, but they didn't answer my question. Here is my issue. I have a mailserver on my dedicated server with full access. In robots I wrote down these lines of ...
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1answer
1k views

Outgoing mail fails to be received by Gmail. Rejected because PTR record does not mach forward lookup

My mail server has been sending mail with no rejections from gmail until recently. No changes have been made that I am aware of. Recently my outgoing messages are failing with an error about a "...
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1answer
111 views

Format for/creation of PTR and SPF records?

Let's say that I have a server that resides at Linode that I use for my business, mybusiness.com. It has an IP Address of 1.2.3.4, and an A record of myserver.mybusiness.com. I own the domain name ...