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    Home»General Articles»What is Authoritative and Non-authoritative DNS Server

    What is Authoritative and Non-authoritative DNS Server

    RahulBy RahulJune 30, 20172 Mins ReadUpdated:July 25, 2019

    What is Authoritative and Non-authoritative DNS Server? Understand the difference between Authoritative and Non-answer for DNS query in simple words.

    What is Non-Authoritative DNS Server?

    Non-authoritative name servers do not contain original source files of domain’s zone. They have a cache file for the domains that is constructed from all the DNS lookups done previously. If a DNS server responded for a DNS query which doesn’t have original file is known as a Non-authoritative answer.

    For example, we query for DNS records of domain tecadmin.net and Google’s open DNS server 8.8.8.8 responded for this query which doesn’t contain domain’s original zone files. This answer is known as a Non-authoritative answer.

    nslookup tecadmin.net
    
    Server:         8.8.8.8
    Address:        8.8.8.8#53
    
    Non-authoritative answer:
    Name:   tecadmin.net
    Address: 104.27.189.217
    Name:   tecadmin.net
    Address: 104.27.188.217
    

    What is Authoritative DNS Server?

    An authoritative name server is a name server that has the original source files of a domain zone files. The is where the domain administrator has configured the DNS records for a domain. Authoritative DNS server can be master DNS server or its slaves.

    For example – domain tecadmin.net’s authoritative are alec.ns.cloudflare.com and athena.ns.cloudflare.com. If you directly query to these DNS servers, they will return authoritative answer because they have the original files of domain zone.

    nslookup tecadmin.net alec.ns.cloudflare.com
    
    Server:         alec.ns.cloudflare.com
    Address:        173.245.59.59#53
    
    Name:   tecadmin.net
    Address: 104.27.188.217
    Name:   tecadmin.net
    Address: 104.27.189.217
    
    dns dns server
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    4 Comments

    1. mike on August 13, 2020 7:52 am

      this is not correct. non-authoritative server respond means that the original files exist on this server. authorative server respond means that your request look up the cache of the dns’ that you are using on the device which you send requests from.

      Reply
    2. Saima Behan on July 28, 2020 3:37 pm

      Simplified precisely. Weldone!

      Reply
    3. Tony Massa on July 24, 2019 3:18 pm

      Explained it very well, thank you for your time in doing this.

      Reply
    4. Mojtaba Rezaeian on July 12, 2019 5:24 pm

      Very Helpful. Thank you

      Reply

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