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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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The correct PTR record in DNS

I'm confused with my DNS records. I own a domain (e.g. example.com).I've set A record for my SMTP server (e.g. smtp.example.com) for outgoing emails. The email address is (e.g. person1@example.com).I've set A record for my POP3 server (e.g.…
Anthony TSANG
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Get IP network range after reverse DNS?

For analytics purposes, I'm looking at large sets of IP addresses in server log files. I'm trying to perform reverse-DNS lookups to understand where traffic is coming from - e.g. what percentage of IPs resolve to corporations, schools, government,…
Max
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Reverse lookup SERVFAIL

I just set up a DNS server and a web server using Virtualbox. The IP address of the DNS server is 192.168.56.101 and the web server 192.168.56.102. Here are my configuration files for the DNS server: named.conf: [quan@localhost ~]$ sudo cat…
Quan Tran
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Is there a way to use Bind9 $GENERATE directive for rDNS of ranges bigger than /24?

The $GENERATE directive of bind9 makes it possible to autogenerate the reverse mapping for a range of IPs what is really helpfull for reverse dns of a dhcp range. But it seems that the $GENERATE directive can only generate the reverse dns for a /24…
nazco
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Forwarder DNS not resolving reverse lookups

I have created one new DNS server in lab and its working properly. Earlier we were using another DNS server for lab PC's as 10.20.30.xx. which is outside the lab premises. now issue with newly created as its not resolving query as previous. I am…
user216358
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How to DNSSEC Sign Bind9 Reverse Zone

I'm using bind9 and dnssec-keygen/dnssec-signzone. I've had no problem signing my forward zones however I cannot seem to find any documentation on signing reverse zones. What is the process for this?
justinzane
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Wildcard DNS like "*-test.example.com"

Is it possible to set up a wildcard domain like "*-test.example.com"? The main reason I'm asking is because I'm in the process of setting up Continuous Integration with Jenkins, and we'd like to automate the setting up of QA sites to test out…
Sean Hagen
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How Reverse DNS does what it does

Hopefully this is not a stupid question, but I cannot find a clear cut answer. Can someone please inform me exactly what 'source address' is used in Reverse DNS? Does rDNS pull the IP address from the Received: portion of the header, or does it…
burmat
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how does domaintools.com perform it's reverse ip lookup?

I'm attempting to improve my understanding of the DNS system and am confused as to how domaintools.com manages to resolve all DNs associate with an IP addr. After playing around with dig, i'm stuck. Example on domain dressupgames.com using dig:: $…
user15411
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What is the correct mail set up for multiple domains on one server?

I have a machine (centos 5) with one external ip address. On that machine I have many virtual hosts with a few different top level domain names and sub-domains under those…
marcnewport
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How do I update my servers' domain name for Reverse DNS?

I'm updating my mail servers' rDNS and I think I have it all figured out except for one thing. When I installed my OS (Debian Etch), the installer asked me to enter the "domain name". Is the "domain name" updated by using the hostname command? If…
Jeff
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PTR and A record must match?

RFC 1912 Section 2.1 states the following: Make sure your PTR and A records match. For every IP address, there should be a matching PTR record in the in-addr.arpa domain. If a host is multi-homed, (more than one IP address) make sure that all…
somecallmemike
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PTR records not been created and/or updated

Windows domain, domain and forest functional levels at Windows Server 2003. Windows 2003 and 2008R2 domain controllers. Same for DNS (AD integrated). Dynamic updates on DNS zones are set to "Secure Only". DHCP running on Linux, it is not set the…
user1797
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Running own DNS server

I have for a long time had my own "play-around" domain kaareskovgaard.net where I've had a minor blog running. I recently decided that I wanted to try to run my own server on it, and so I ordered a VPS for it. I have managed to relocate my site to…
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My ISP set up a PTR record for my mail server, but some places aren't seeing it

I have a VPS running Windows 2008 server with plesk 9, which I am using for email. I asked to my ISP to add a PTR record, which they did but my mails still droping into spam box. I have checked almost every DNS tool I can think of, and sometimes it…
Dali
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