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.

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Reverse DNS error

Today I changed my DNS and nameservers to Cloudflare. After that, pingdom gave some strange DNS errors. I searched the internet but couldn't find a solution. The errors are: Could not find reverse ...
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1answer
27 views

Spamassassin RDNS_NONE matches, but there is a RDNS

I got a a little problem - spam assassin's RDNS_NONE-rule matches on my outgoing mails but there is a RDNS set for all hosts, that are in the delivery-chain. If I send an Email to ...
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1answer
35 views

AWS DNS Error - SERVFAIL

So I have followed the configuration guide provided by Amazon (http://docs.aws.amazon.com/Route53/latest/DeveloperGuide/CreatingNewDNS.html), but I cannot get the URL/Domain to be send out to the name ...
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1answer
39 views

Configuring Reverse DNS on Windows Server 2008, can't send email

I run a VPS on a Windows Server 2008 machine, and since I got it in January 2015 everything has been running fine, the server has IIS, DNS, and uses Mailenable for email exchange. I've been running ...
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1answer
71 views

Reverse zone not working with BIND9

I'm trying to configure a DNS server in UBUNTU 12.04 with BIND9 service.I'm able to successfully configure the same and the when I'm executing nslookup command it works well.However,the host command ...
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27 views

How can I make Windows DNS Scavenging to begin immediately?

I turned on scavenging for a single reverse zone, defaults 7 days for both. I then right clicked on the server and selected Scavenge stale resource records. I looked a the reverse zone, clicked ...
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43 views

Setting up reverse DNS correctly and testing it

I have a mail server which I setup reverse DNS on an Azure service. The IP of the server points back to email.example.com which is what I set it to. I also set my local host name and welcome message ...
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0answers
83 views

Postfix on server with multiple IP addresses sends mails with wrong HELO in header

I have a VPS with multiple IP addresses: venet0:0 x.x.x.2 venet0:1 x.x.x.3 venet0:2 x.x.x.4 venet0:3 x.x.x.5 All IPs have A records m2.domain.com -> x.x.x.2 m3.domain.com -> x.x.x.3 ...
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1answer
43 views

Hotmail/Outlook dumping apparently valid emails

I've written some software that operates a non-commerical contact list for clubs, where the server sends out admin mails to the entire club. The emails are received Ok on Yahoo, gmail, and AOL, but ...
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40 views

Centos-bind: Reverse DNS failed

Hi Server fault member, I need to setup a reverse DNS for my client. There have 3 IP ranges on the rDNS server. The server system is Centos 6.5 with bind 9 Let me describe my situation. I have a ...
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1answer
52 views

Can I setup the PTR records of reverse DNS with different IPs?

I am very new into the Linux world. I'm trying to configure 3 Authoritative-Only DNS servers. I got everything set up, except for the zone of in-addr.arpa. I have the following servers with the ...
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1answer
23 views

Is it possible to set up a reverse DNS record on AWS for address from a different registrar?

I don't have control over the registrar for the domain we use but the elastic ip and domain have been registered to each other - now I need to set up a mail server on my EC2 instance and therefore be ...
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2answers
51 views

What can happen with wrong rDNS?

I noticed, that i had the rDNS for some server wrong. It did not cause any problems, but i am wondering, what can happen with wrong rDNS except from obviously getting spam point or even mail rejected, ...
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1answer
47 views

How Reverse DNS works?

I was reading pretty a lot, but still can't get it. For example we have example.com, 127.0.0.1 and 1.0.0.127.in-addr.arpa for example Forward DNS is simple. example.com points to 127.0.0.1 What is ...
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1answer
114 views

my host has no PTR record [closed]

when i check my host i get this host myIP xx.xxx.xx.103.in-addr.arpa has no PTR record So i dd this to my /var/named/domainname.com.db myHostname. IN A myIP xx.xxx.xx.103.in-addr.arpa. IN PTR ...
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1answer
31 views

What should be the reverse DNS for the email server?

When I nslookup x.x.x.x my web server's IP address I get this error: Non-existent domain. Must it return the top domain like mydomain.com or it is okay to return ...
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2answers
85 views

mx server: multiple domains on one ip

I'm just a bit confused about the correct DNS setup for hosting multiple domains on a single server with one ip. For example the mail server (domain/reverse: example.com) should host 3 domains: ...
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2answers
133 views

CentOS Cannot resolve any hostnames

I am trying to set up a server(PHP/HTTPD) in CentOS. When I use ipaddress to access the website its working fine. But using domain name its not working. So I used ping command to check. ping ...
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1answer
46 views

nslookup does not work on certain IP address [closed]

when I gave nslookup 74.125.236.200 Server: 192.168.5.11 Address: 192.168.5.11#53 Non-authoritative answer: 200.236.125.74.in-addr.arpa name = maa03s17-in-f8.1e100.net. ...
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0answers
46 views

How do I restrict the domain name for reverse DNS updates with bind and nsupdate?

I've set up Bind to allow hosts to update only their own DNS entries, but I'm having trouble with the reverse DNS portion of this. My configuration is as follows: named.conf options { listen-on ...
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0answers
50 views

Captive portal and walled internet

I am creating a tour guide app which visitors can download when they arrive on location. There will be a Hotspot to which they connect, they will get a welcome page with instruction (and a button to ...
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2answers
200 views

Do I need to Set-up PTR record in SPF Setting?

I have set-up the RDNS from my hosting provider for the ip address to resolve to "maximus.example.com". After that, do I also need to add the PTR records to the SPF Text details in my DNS zone file as ...
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1answer
72 views

Returning mails - revDNS + Helo command rejected: Host not found [closed]

i've got a VPS server and directadmin with multiple domains on it. I've noticed annoying problem with email sending on one of domains. Sometimes when I send email to client it bounce to me with ...
2
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1answer
86 views

Is it possible to set a PTR record for Github Pages hosting?

Icelandic domains (.is) require that their domains support reverse DNS, which means configuring PTR records on the hosting server. Is it possible to set up a PTR record for GitHub Pages site hosting? ...
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1answer
57 views

IPv6 record will not take for rDNS

I added the following to named.conf zone "3IP6.A.B.C.ip6.arpa" { type master; file "3IP6.A.B.C.ip6.arpa"; allow-update { none; }; }; I then created my dns zone record called 3IP6.A.B.C.ip6.arpa ...
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1answer
143 views

Reverse DNS record can't point to Domain name but it can point to IP [closed]

I am using parallels plesk for hosting my websites, Some days ago I tried to send emails from my mail server and the mails were going to spam,So i tried spam assassin to detect whats wrong. Here is ...
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2answers
117 views

Managing IPv6 rDNS

Still very new to IPv6 and I talked to my datacenter and they do not do rDNS for IPv6. Unfortunately we currently do not support rDNS for IPv6 allocations. We can however delegate the IP block ...
2
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1answer
106 views

Cannot load reverse lookup zones containing “rich-text” PTR records

Summary I am attempting to set up Wide-Area Bonjour (aka DNS-SD) using ISC Bind 9.9.5, but cannot load reverse lookup zones providing discovery of "rich-text" service domains. Background According ...
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3answers
73 views

Appropriate PTR records for mail server [duplicate]

I realize this is a common question around here, but I'm having trouble understanding one part of it. I want to setup a mail server to send newsletters and other marketing emails for a few of my ...
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1answer
176 views

Windows Reverse Lookup Zone & Subnetting

We have a /23 subnet that we are trying to create a reverse lookup zone on our Windows server. 172.16.150.0/23 Unfortunately we can't add a subnet mask. None of the links I've found thus far make ...
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1answer
123 views

hMailServer IP got blocked, what should I do?

I'm using hMailServer application in order to host my own mail server. I'm currently hosting three domains (I just buy the domain and host them in my machines) Everything is doing well, all my ...
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1answer
923 views

How to add reverse dns record on cloudflare [closed]

I need to set PTR record on my cloudflare account, because all outgoing mails are going to spam. I do not see ptr record in my cloudflare account. Can I use txt/srv record instead?
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1answer
111 views

ipv6 reverse dns not working unless +trace is specified

I'm trying to set up reverse dns for ipv6 in my lan. The dns server which should be delegated is at 2001:5c0:1400:b::9 and an host for which RDNS should work is at 2001:5c0:1500:300::1. The problem ...
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38 views

One vps 2 ips 2 domains

So like the title suggest I have 1 VPS, 2 IPs, and 2 domains. It has been a constant uphill battle trying to keep things separate so before I continue I would like to ask is it even possible? So as ...
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1answer
504 views

setting correct PTR record for domain and postfix email server [closed]

I have a problem where I recently figured out, that describes this output! What steps to do to set the DNS PTR record, is the IP in reverse in the name needed? The zone of my domain is: ...
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171 views

PowerDNS Reverse lookup is not responding in VPN connected network

I created a test network. It is a star VPN network with: - 1 main router - 2 subrouters (DrayTek Vigor 2920) - behind each router a client - behind the main router a PowerDNS machine now the ...
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29 views

Priorities or ambiguos DNS reverse zone with Bind

In my internal DNS running on Bind9 all machines are available at up to 3 different domain names, i.e. all machines are listed as machine.legacy.domain and machine.new.domain. Some machines are joined ...
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1answer
2k views

Zimbra uses other IP than assigned, causing HELO/Reverse-DNS mismatch

We've got a vServer running Zimbra and a web server, each of them having its own IP address. 1.1.1.11 - vServer, running: -- 1.1.1.12/mx1.ipsum.com - Zimbra mail server -- 1.1.1.13 - web server ...
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1answer
621 views

Fix “DNS hostname not available” on server behind firewall

I am running Max OS X Server and can't set up Open Directory. I get an error saying that "This computer's host name is invalid. The host name does not resolve to any configured address of this ...
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1answer
375 views

reverse dns not propagated

I defined reverse dns zone for server muq.ac.ir in name server which responds to name resolutions for domain muq.ac.ir server. Then I add a ptr record for ip address 80.191.92.199 with value ...
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1answer
626 views

How to get reverse DNS to work for multiple IPs and domains on Windows Server EC2 instance?

I have a EC2 instance setup running hMailServer. I have a primary IP on the system that I am using for example1.com email. I would like to also add a second domain example2.com using a different IP ...
0
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1answer
50 views

Deleting reverse zone in windows 2003 DNS server

This is my first time posting here on server fault. The problem i am faced with is when i try to add another DC to my network i am getting a very weird error. After some countless hours and re-reading ...
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2answers
165 views

Reverse DNS entry when using “external” dns server

Administrator of my company allowed me to put my own server in our datacenter and gave me one public address of our AS pool. I've installed linux and configured basic services. Then i've added A ...
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1answer
88 views

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. ...
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1answer
35 views

rDNS and hostname conflict

My server has 3 IPs: 2 for dns stuff for example 192.0.2.1 and 192.0.2.2, and one that I use for outgoing email, let's say 192.0.2.3. My hostname is mail.mydomain1.com. The problem began when I ...
21
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1answer
1k views

Do internet standards require reverse DNS for every device?

The requirements surrounding reverse DNS are confusing! People frequently talk about everything breaking if reverse DNS is not present, and that sounds scary. Even in cases where applications don't ...
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1answer
64 views

Reverse DNS zones, are they gluable?

Our DNS infrastructure is a bit fractured. We have multiple separate DNS servers for different parts of the company. However, we do still have some interchange issues. Right now a server from ...
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1answer
409 views

Two servers, severals domains, reverse DNS and blacklist

I will try to explain the context. 2 VPS with PLESK 11.5 The first (named vps67877.ovh.net - we call it v67) is a mail server (ip 37.187.33.38) The second (named vps68789.ovh.net - we call it v68) ...
2
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3answers
246 views

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 ...
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295 views

Cisco DNS Inspection disallows Reverse Lookup

I'm trying to use DNS Doctoring on my ASA 5505, but apparenly DNS Doctoring required DNS Inspection, and DNS Inspection forbids reverse lookup requests?! How do work around this? I did find this: ...