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Questions tagged [reverse-dns]

Reverse DNS lookup is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet.

Reverse DNS lookup or reverse DNS resolution (rDNS) is the determination of a domain name that is associated with a given IP address using the Domain Name System (DNS) of the Internet.

Computer networks use the Domain Name System to determine the IP address associated with a domain name. This process is also known as forward DNS resolution. Reverse DNS lookup is the inverse process, the resolution of an IP address to its designated domain name.

Source: Wikipedia.

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dns mx record vs reverse dns

I need some help on clarification of the reverse DNS and MX record setup. I wasn't able to find definitive answer on google. The case is following. Say I have domain "mydomain.com", I have a SMTP server named "mail.mydomain.com", which is hosted by…
Greg
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Reverse DNS the reason my Mails are rejected?

Since I switched ISP I'm having quite some problems with my mail. Sometimes mails will be rejected by the receiving side with the following message: This is the mail system at host mail.xyz.ch. I'm sorry to have to inform you that your message…
cdecker
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DNS PTR record when domain on shared IP address

I own a typical shared IP hosting plan and domain. I can modify the DNS of the domain from the control panel. The mailserver shares the same IP address, so my typical DNS config is: www.mydomain.com A -> myIP mydomain.com A ->…
Marco Demaio
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Reverse DNS Lookup from the Command Line

I'd like to get a list of all domains pointed to a certain IP address. Is there a way to get this information from the command line? Nothing like "host", "nslookup" or "dig -x". Those return the hostname of the IP address which, while helpful, is…
nowthatsamatt
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Derive IP Address of DNSNode record in Reverse Lookup Zone using LDAP query

Wanted to ask a question: How is it possible to derive IP address from querying a DNS Node in Reverse Lookup Zone with LDAP? To be more precise, I want to show you what I've been trying to achieve: Properties of DNSNode In the picture above we see…
user3191591
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in-addr.arpa zone delegation in Bind 9 and Samba 4 as an AD DC with DDNS

Environment and goals In my testing KVM lab I have a virtual network 172.16.50/24, in this network I have got 2 Centos 7 VMs running Bind 9 and ISC DHCP servers: Мастер DNS : controller.wsvirt.home (172.16.50.2) Slave DNS: controller2.wsvirt.home…
treegor
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Is an rDNS PTR record really necessary to avoid spam filters?

I realize this is a somewhat abstract question, but does anyone have any experience with setting up an e-mail server without an rDNS record? I ask because I really want to host my mail server at home, however my ISP doesn't support creating an rDNS…
Steffen
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Nginx bind to external IP only (listen hostname:port)

I'd like to specify an nginx server that listens only on external IP of an hostname given in listen directive. My server has domain name foobar.example.com which resolves to public IP 1.2.3.4. When I configure nginx server like this server { …
woky
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Having multiple A records to get forward rDNS to work

Running a Droplet on DigitalOcean with Apache and a mailserver on Ubuntu. I've managed to get SPF, DKIM and DMARC working on this server, but Reverse DNS is something that I've never figured out. I have a floating IP that points to this particular…
John Doe
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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 ;; ANSWER SECTION: xxx.xxx.xxx.xxx.in-addr.arpa. 86399 IN …
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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 contain an answer. The config has multiple views.…
AaplMike
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Azure and DNS services

I have a Virtual network (MyVPN) resource in Azure, being a class C network, MyVPN has Azure provided DNS service as DNS servers, so all virtual machines with a NIC connected to this network are able to resolve their hostname successfully, for…
Navarro
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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 logs, not just the user mailboxes). I suspect a…
Jan Fabry
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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 instance, a cron job on the server…
amoe
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Multiple mail servers and reverse DNS

If I have three mail servers MS1, MS2 and MS3 all with different IPs but share the same domain name (exampledomain.com) and I use an SPF record to specify them, how would reverse DNS work on the server receiving mail from any of my mail servers…
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