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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How to use the hosts file to make google.com resolve to bing.com on a single machine

I am having a little trouble understanding how to manipulate the hosts file. I am using IIS 7.5 and Windows Server 2008 RC2. How can I make any requests from my machine to google.com resolve to bing....
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What services require properly configured PTR records?

I manage a few DNS servers (Bind9, Windows Server 2008 R2) that are used internally. I have always taken the time to make sure that the correct corresponding PTR records were configured for Reverse ...
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Disable reverse PTR check in Zimbra and force accept from invalid domains

I've moved an older Sendmail/Dovecot system to a Zimbra community edition system. I need to be able to receive messages from certain standalone Linux hosts that may not have valid A records or proper ...
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reverse lookup not working with my own nameservers for any internet address

I have two DNS servers running. With internal addresses it is no problem to look them up both ways: user@ns1:~$ man named.conf user@ns1:~$ host vh01 vh01.example.de has address 192.168.180.4 user@ns1:~...
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How are DNS PTR records managed?

As I understand it, an IP address-owner can set up a DNS PTR record for his IP address to map the IP addresses to its host names. There are some things about this I don’t understand. I’ve managed ...
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rDNS mx record problem, smtp test fails

down vote favorite I am doing test at mxtoolbox.com ptr: ip -> mydomain.com mx: mydomain.com ->myip but smtp:173.231.15.144 -> OK - myip resolves to myip.hosted.static.hostingfirm.com / Warning - ...
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Reverse DNS not resolving for IPv6 addresses in BIND

Reverse DNS entries for IPv6 addresses are not working. Everything I've read on the subject says the following configuration should work: In named.conf: zone "0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.3.0.0.0....
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spam problem related to reverse dns config

I have a client whose ISP recently switched their circuit and static IP to an IP that was already blacklisted for SPAM (nice). The client is running Windows SBS 2003 with Exchange 2003 and DNS for ...
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setting the reverse dns for a email server

'm having some trouble with email on a dedicated server, with Windows Server 2008. I've reached the conclusion I have to setup reverse dns for the mail server. The current setup is this: The mail ...
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setting the reverse dns for a email server [duplicate]

Possible Duplicate: setting the reverse dns for a email server I'm having some trouble with email on a dedicated server, with Windows Server 2008. I've reached the conclusion I have to setup ...
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1answer
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How to configure Reverse DNS (PTR) records correctly for multiple domains on a single IP

I run a Virtual Private Server on which I host a number of websites using a single IP address. I need to configure Reverse DNS for each domain. Is this possible and what is the best way to go about ...
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DNS resolving error

I am using a linode running nginx. I wanted to have mail sending capabilities on my VPS, so I change the hostnames and reverse DNS but now I have messed up my DNS somehow and the site doesn't even ...
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How to setup reverse dns for Virtual dedicated server(godaddy)

I have a problem in resolving the domain and found out that there is a issue with dns settings. I wanted to configure Reverse DNS for my virtual dedicated server(windows). My isp is godaddy. How ...
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362 views

Mail deliverability rDNS best practice

I have an email server which sends email for multiple websites (different domain names each) the reply-to will correspond to no-reply@website-a.com (or whatever their username/website is) but the ...
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My Reverse DNS PTR record seems to be right, but I'm still getting bouncing email

I have a service (statusme.com) where I let people know (for example) that their kid's soccer games are cancelled because of bad weather. We send out emails to the people who have registered. I have ...
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3answers
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SMTP host name vs. domain in “From:” address vis-a-vis Email Deliverability

I'm trying to implement (or make sure that I'm correctly following) email sending best practices to improve deliverability, but the role of the smtp server's host name vs the domain name of the From: ...
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e-mail RDNS lookup

I'm getting lots of junk "return to delivery" mail on my server, so I would like to add this "RDNS" lookup thing in Ubuntu. But I can't figure out how. Most documentation is about regular DNS servers....
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Multiple PTR records

In your experience, have you found there to be any actual problems with having redundant PTR records (same name, multiple IPs) for a given host? Additionally, would you expect to see corresponding A ...
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BIND9 reverse DNS, /16 zone

I'm trying to set up a reverse zone for the entire 10.200.x.x/16 subnet. I've configured everything according to named.conf and several different blog posts, but no luck. Note that the A-records ...
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Mysql can not resolve hostnames when checking privileges

I'm going crazy to solve this. I have a mysql installation (on machine db.example.org) which doesn't resolve a given hostname. I gave privileges using hostnames i.e. GRANT USAGE ON *.* TO 'user'@'...
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how to add a REverse PTR Record on Amazon Route 53?

if i have the below ip 168.144.254.X and i would like to add a ptr record in amazon in the form of X.254.144.168.in-addr.arpa what should be in the name field and what should be in the value field ...
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configure Reverse DNS for VPS with amazon route 53, ISP or Amazon Route 53 issue?

i have a VPS hosted with myhosting.com, the domain is hosted in godaddy and the DNS records are managed in AMAZON route 53. i was told by myhosting support that i should create a PTR record on my DNS ...
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DNS, should I be using A instead of CNAME?

I'm doing a big reshuffle of our websites and hosting, moving about 10 domains to a new server. In doing so I had to make some changes to the DNS, pointing all of the domains at the new server. ...
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Private DNS Question

I received the below request, just curious how I can go about doing this. I have IPs direct from ARIN and my own rdns server. ** As you guys know I am a mailer, but I keep things very clean. My ...
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Reverse DNS Delegation from ISP

I get a /29 Delegated to me from Verizon(Fios) and I got them to delegate rDNS to my Name servers, I Notice that with some systems that it works and is able to get my PTR record, but on some it isn't ...
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Resolving FQDNs on Mac DNS Server from a WAN (externally)

I am quite a newbie at this, so please spare me the stick. I have the following networking topology - Comcast Business Gateway<->SonicWall TZ Router<->LAN (Mac OS X Servers). I am using my ...
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What's wrong with my reverse lookup zone?

I am in the process of building a small network with several servers. I am using Server 2008 R2 and have one server (adc01.m6.local = 10.18.1.1) running as the domain controller and DNS server. The ...
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How to safely send newsletters on VPS (SMTP) w/ non-hosted domain as “From” email?

Greetings, I'm trying to understand the safest way to use SMTP. I'm considering purchasing a second virtual server mainly for email sending, on which I will set up PHPlist (a free open-source ...
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How to setup PTR (Reverse DNS) at Godaddy DNS manager

My hosting provider already did PTR setup. Now i have to setup it at my DNS holder i guess. What am i supposed to do at my Godaddy account. thank you. my ip : 64.250.113.235 and you can check my ptr ...
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Custom hostname instead ISP's

I have setup a Centos 5.5 server and a domain name (say mydomain.com) pointing to it (using bind9) with custom nameservers (like ns1.mydomain.com and ns2.mydomain.com). Everything works fine but there ...
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What is reverse DNS?

I've lot of *.in-addr.arpa domains requests in my OpenDNS account. I know this should be normal and it's about reverse DNS. I've been reading here and there but still I can't really get how it works ...
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SSH reverse DNS lookup

I was wondering why I'm connection to a server with SSH, it does a reverse DNS lookup on the IP of the remote server. I have found comments telling that it was for security reason, lots of tutorial ...
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Active Directory domain.local corrupt

We have a small business server 2008 running in windows hyper-v, yesterday the hyper-v manager reported the SBS server was in ‘Pause Critical’ state. This turned out to be because of snapshots ...
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Should my dedicated static IP address point to my domain?

I purchased a dedicated static IP address from my hosting company to host my domain name. The IP will point to me domain when I ping it. However, when I conduct reverse DNS lookup, my dedicated IP ...
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Slow connect on ssh on Ubuntu

I've recently installed Ubuntu 10.10 as a second OS on my desktop, but I'm having a strange problem: it takes several tens of seconds to connect to other linux machines via ssh. On Windows, I have no ...
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ISPs and reverse DNS lookups

I read in easyDNS that, in order to set up reverse DNS, "The IP block must be delegated to our nameservers by your ISP." Is that always the case? What if you decide to host your name servers? Will ...
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606 views

Setting Up Reverse DNS

I am on a VPS with root access. Using WHM I followed the instructions here I put the last octet in my ip address in the domain field. left the TTL as 14400. Set the record type to PTR In the ...
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Mac OSX Server 10.6 DNS Issues

The server was upgraded from 10.5 from 10.6, during the upgrade the Reverse Zones were lost so I tried to recreate these but found that it's best to delete all zones, definitions and start again. So ...
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Moving from one ISP to another; DNS PTR question

We are going to be moving from one ISP to another in the next month or so, and I will be changing the TTL's down to 60 seconds on the DNS servers that I have authority for, but our current ISP has ...
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3answers
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Exchange 2007 Delivery Delayed (maybe need certificate?)

Last week, I setup a new domain and Exchange Server 2007 SP1. I created new accounts and mailboxes for my 30 users and imported all mail from their old domain to this new server. It's a Hub Transport ...
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Reverse DNS lookup takes 5 seconds to give up

I have a Debian 2.6.26-2-xen-amd64 system which takes 5 seconds between the second and third failed reverse DNS lookup. All (most?) other similar systems here do the three lookups with little wait ...
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Apache: allow from domain without using reverse lookup

I want to allow access to a folder from a "domain name" instead of IP address in apache. Now, allow from accepts domains as arguments, but I think it also does a reverse DNS lookup to cross check (...
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WAN IP displayed in Headers when sending via SMTP Virtual Server

On my Windows server 2008, I have IIS 7, ColdFusion 9, and the virtual SMTP service installed. I host several applications on the server that send emails using the virtual SMTP service. Each ...
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3answers
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Why bother with RDNS?

What are the advantages of setting up reverse DNS? I have a VPS with one static IP address, where I host several web apps each with its own domain name.
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550 Requested action not taken: mailbox unavailable

I setup a small box with Server 2003 64bit to be used as a webserver and email server for a small school. Real simple stuff for a few users. A simple website and a handful of emails. rDNS and spf ...
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Problems with reverse DNS pointing to unknown hostname

I am trying to create nameservers in my new OpenVZ VPS. It is a box running debian and I have installed webmin. When I check if the primary nameserver is working I get the following message: ...
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Is there a way to resolve an IP address to all domains resolving to that IP? [duplicate]

Possible Duplicate: Finding all domain names that resolve to the same ip? I am trying to find out if a dedicated server at a hosting site I am using has more than one domain pointing to it ...
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2answers
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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 ...
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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.
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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 & ...