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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EMail SMTP issue

I am running several websites on a Windows VPS that have "recommend this to a friend" type of emails. I get frequent bounces. The provider allows us to configure reverse DNS records for all the ...
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6answers
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Multiple Reverse DNS Entries?

I'm a DNS noob, so here's a question: Can a server have multiple reverse DNS entries? Or does one IP address just resolve to one DNS name? Here is why I need this: I have a number of sites hosted ...
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3answers
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Reverse DNS issue in Win 2003

I am maintaining a DNS and mail server in win 2003, and the ISP made me authoritative for the domain. They say: ----- Start of the email received from the ISP-------- 96/28.204.xxx.yyy.in-addr.arpa ...
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Reverse DNS Question and Qmail

I've setup a mail.example.com, pointed it my server IP. I've also got my provider to setup a Reverse DNS to my server ip to the domain name I setup. AFAIK, what I need now is mail being sent from my ...
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4answers
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Switched netblocks, new DNS resolving PTR to old DNS IP - why?

A bit of a weird problem here and hope someone can help describe and/or fix with me. We were on a /24 network A.A.A.A and recently switched to B.B.B.B. The nameservers were all updated with the ...
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4answers
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How does a Reverse DNS lookup work with regards to spam filters?

I have heard that most spam filters use a reverse DNS lookup on the originating IP address of the sending SMTP server (or something like that) as part of the verification process. I want to make sure ...
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10answers
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What's the command-line utility in Windows to do a reverse DNS look-up?

Is there a built-in command line tool that will do reverse DNS look-ups in Windows? I.e., something like <toolname> w.x.y.z => mycomputername I've tried: nslookup: seems to be forward ...
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5answers
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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 ...
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6answers
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Finding all domain names that resolve to the same ip?

Lately I've been tracking a spammer on craigslist. I recently discovered that he's added a new technique to his arsenal, he registered a whole bunch of domain names but they all resolve to the same ip ...
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5answers
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How do I configure reverse DNS for a SMTP server [duplicate]

We use iis 6 to send out emails for our website but some email addresses bouce backs. It only appears to be 2 addresses. There is at least 100 different email addresses sent to at the same time as ...
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3answers
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Will adding a second SPF record mess up my DNS?

Will adding a second SPF record mess up my DNS, or will it be like adding an extra nameserver? (i.e. it only helps, not hurts)
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5answers
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Reverse DNS - how to correctly configure for SMTP delivery

I started a new service and we need to send emails to our customers (new account confirms, etc). My server is known as prod01.bidrodeo.com and resolves to 97.107.134.38 . For reverse DNS, ...
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4answers
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Reverse DNS in a CIDR world

Reverse DNS seems to be strongly tied to class boundaries, what methods exist now that CIDR is the standard to delegate authority for a subnet? If multiple methods exist which one is best? Do you ...
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1answer
3k views

DNS Server Configuration problem , PTR records

Hi I have a server that using Windows server 2003 , and Microsoft DNS Server. I have a problem on my DNS setting ERROR: No reverse DNS (PTR) entries. The problem MX records are: ...
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2answers
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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 ...
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1answer
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Remote connection to MySQL server takes very long

I have a MySQL 5.0.75 server running on my Linux notebook to which I want to connect from another machine in the local network. This connection takes 5-6 seconds: mysql -h 172.22.65.101 -u myuser ...
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4answers
779 views

Is OpenDNS safe to use in a location with Exchange/Reverse DNS

I like OpenDNS, but was wondering if anyone has experience deploying it for a location with an Exchange installation. I'm concerned specifically about whether any filtering they do would cause ...
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10answers
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What's the reverse DNS command line utility?

What's the command to find the name of a computer given its IP address? I always forget what this command is, but I know it exists in Windows and I assume it exists on the *nix command-line.