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Exactly what does a forward and reverse lookup zone do

Axter
Axter asked
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Last Modified: 2011-10-03
Exactly what does a forward and reverse lookup zone do?

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Top Expert 2007

Commented:
A forward Zone will resolve domain names to IP addresses

e.g.

nslookup www.yahoo.com

The above should give you the address(s) of www.yahoo.com

Plus , forward domain will reply to queries about other type of dns records like NS, MX, etc.

A reverse zone will map an ip address to a domain name

e.g

nslookup 193.100.2.1

The above should give you the actual domain name for that ip (if configured / set. Not all ips are mapped back to domain names)

AxterSenior Software Engineer
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Author

Commented:
>>Not all ips are mapped back to domain names

How would I go about mapping them back to the domain names?
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Commented:
You need a reverse DNS entry on your ISPs DNS servers NOT your Domain's DNS provider unless they are the same.  Contact your ISP and tell them you need a reverse DNS for your IP to resolve to the FQDN ie. smtp.domain.com
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Top Expert 2007

Commented:
Normally public IPs are managed by the ISPs, and they own the reverse lookup zones for these ips.

But, if you have the owner ship of certain range, you may arrange with your ISP to delegate the management of the zone of your ips and then you can configure a reverse lookup zone on your dns server.

AxterSenior Software Engineer
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Author

Commented:
>>You need a reverse DNS entry on your ISPs DNS servers NOT your Domain's DNS provider unless they are the same.

I believe they are the same.  This is within a major company's network.

Exactly where would I add the reverse DNS?
I'm looking at one of the domain server's DNS, and I don't see an option in the GUI to add a specific IP for a specific computer.
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Commented:
Create a new A record and the option for a reverse pointer should be there, however not all DNS management software is the same.
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Top Expert 2007
Commented:
This one is on us!
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