Public vs Private DNS

Posted on 2011-10-28
Medium Priority
Last Modified: 2012-05-12
what is the difference between Public vs Private DNS
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Expert Comment

ID: 37044490
Here is a list of the private network ranges - all other are public (private DNS may also refer to internal DNS server where A records etc are looked up vs internet domain names): to, which provides a single Class A network of addresses, which would use subnet mask
(theoretically up to 16,777,215 addresses) to, which provides 16 contiguous Class B network addresses, which would use subnet mask
(theoretically up to 1,048,576 addresses) to, which provides up to 2^16 Class C network addresses, which would use subnet mask
(theoretically up to 65,536 addresses)
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Expert Comment

by:Darius Ghassem
ID: 37044499
Really it explains itself.

Private DNS for example your internal DNS servers for your Domain.

Public DNS is for external that the public can lookup aganist.
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Expert Comment

ID: 37044691
dns resolves ip address to hostname/url and and vise verse.
As GOOVY stated there are private network and public networks, explaining how networks infrastructure work and  operate will take more then 1 answer and a wide knowledge in network infrastructure .

you can start here :

read featured content to get a full picture on DNS.



Author Comment

ID: 37044792
what is the purpose of hosting external dns?
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Accepted Solution

Darius Ghassem earned 2000 total points
ID: 37044813
For external DNS resolution. If you host your own external DNS servers then you would an internet DNS server but usually most allow a domain name registrar or a third party take care of their external DNS records

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