Public vs Private DNS

Posted on 2011-10-28
Last Modified: 2012-05-12
what is the difference between Public vs Private DNS
    LVL 13

    Expert Comment

    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)
    LVL 59

    Expert Comment

    by:Darius Ghassem
    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.
    LVL 11

    Expert Comment

    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

    what is the purpose of hosting external dns?
    LVL 59

    Accepted Solution

    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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