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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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Changing reverse DNS in Debian Box

I am currently hosting a website within my university environment with the permission from my university sysadmins. This is my scenario: I am running a DNS server on my own and I am using one of the hosting provider's DNS server to point my DNS name…
user5203
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How to get from a name server all A records pointing to a specific IP

How can I get from a specific name server, say ns.example.com, all A records pointing to a specific IP x.y.z.w ?? I've been trying with reverse DNS lookup tools, but I cant manage to get what I need.
GetFree
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verifying whether IP address is associated with an overall DNS name (which has multiple IP's listed)

How can I verify, when I parse a packet, whether the IP address for the packet is one from a specific DNS name that for has many IP's listed (i.e. this DNS name does a round robin type approach & is acting as the main company proxy server DNS name -…
GregH
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Just set up my rDNS entry. Want to make sure I've done everything that's required

I've setup one of my domains to point to my Linode IP address: server.mydomain.net > 1.1.1.1 I then went into my Linode DNS manager and set the rDNS entry to the above URI. I then set my hostname on the server with the following: cat…
Glenn
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Migrated to new server, DNS setup >48 hrs, some MySQL inserts from domain still show up on old server

Title says it all - I've migrated to a new dedicated server at a different IP.. It's been more than 48 hours since DNS was setup. Some MySQL inserts (standard php variables invoke mysql) from at least one domain this server hosts still show up on…
inac
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Does RDNS for mail server have to match the mail server hostname exactly?

Typically when setting up a mail server, I create an rDNS record for the mail server IP to match the mail server hostname (ex: mail.example.com). Can I instead set the rDNS ptr to match the parent domain (e.g. example.com), if this server is being…
mikewaters
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Does "From" field have to have the same domain as the reverse DNS to not be considered spam?

I have 2 applications at the same IP with 2 different domain names. Hourjar uses noreply@hourjar.com for the "From" field when it sends emails, and Nimikri uses noreply@nimikri.com. If my my reverse DNS points back to nimikri.com, will my message…
Brian
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Qmail: relay only from selected servers based on rDNS

I'm looking for a way to disable Qmail relaying for everyone, but allow one certain group of hosts to do so. These hosts all use the same identifying rDNS entry. In Exchange 2003, Postfix, Exim and cPanel this can be achieved pretty easily. However,…
user45577
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Why is awstats reporting my static IP instead of Domain Name?

In AWStats under: "Links from an external page (other web sites except search engines)" it has generated a list of pages that had linked to my page. I see pages like: Bing, YouTube, HotFrog, etc.. However, there are many internal links within the…
Austin
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Failed reverse DNS and SPF only when using Thunderbird!

I have a reverse DNS and SPF records correctly setup for my mail server. Sending webmail from it works perfect. The problem is when Thunderbird sends out emails, it is using the client's IP address for the hostname. I have SMTP authentication and…
TruMan1
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Getting "has no address records (A or AAAA)" error when running named-checkzone

I am currently trying to build my own home lab for the first time, and as a newbie it’s been a bit confusing. For the past few days, I have been working on configuring an internal DNS server, and after setting it up I run the following tests: First…
DiamondFeather
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How to avoid reverse DNS errors

I am running a mail server (Exim) on a VPS (Ubuntu 22.04 LTS). I am able to send and receive emails without problem, but I do get the following errors from mxtoolbox.com: Reverse DNS does not contain the hostname Reverse DNS does not match SMTP…
Bruce Button
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AD reverse DNS zone sharing between subdomains

We have Active Directory infrastructure with one domain and several subdomains. Each subdomain has its dedicated subnets. All DNS servers on DCs have appropriate reverse zones, integrated in Active Direcrory. All works ok. Now, we have a new network…
Dmitry Donskih
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Reverse DNS propagation and caching

I set up a VPS (Ubuntu 22.04, at Contabo in Germany) yesterday. Unfortunately, I got the reverse DNS entry incorrect (I entered example.org instead of example.uk). I spotted this quickly, and corrected it, and both mxtoolbox.com and dig on my local…
QF0
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How to disable or fix OpenStack intercepting DNS PTR queries

I have several virtual machines with Debian/GNU Linux running on OpenStack. When resolving their internal IPv4 addresses I get some strange results: # ip -c addr show dev eth0 2: eth0: mtu 1500 qdisc pfifo_fast…
pmhahn
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