Does DNS allow third parties to register subdomains?

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I have one of those questions that rely on the rule sets for DNS lookup.



Let us say Person A owns the site https://www.example.com. A different person, Person B, not associated with A, attempts to register https://sub.example.com with the local registry. Will the registry allow this? Or is there an implicit understanding that these domain names are linked, and can't be obtained by third parties?



The reason I ask is that my university https://www.sydney.edu.au supposedly sent me a link in an email authored by notifications@instructure.com and this link directs me to https://canvas.sydney.edu.au/.



This looks bad to me. But maybe DNS rules only allow https://www.sydney.edu.au
to have the associated domain https://canvas.sydney.edu.au.



Otherwise, if any person (e.g. a Bad Person) can register https://badsite.sydney.edu.au and DNS lets it go through... then there is a hole in the DNS world that is made for badness.






dns dns-spoofing







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    I have one of those questions that rely on the rule sets for DNS lookup.



    Let us say Person A owns the site https://www.example.com. A different person, Person B, not associated with A, attempts to register https://sub.example.com with the local registry. Will the registry allow this? Or is there an implicit understanding that these domain names are linked, and can't be obtained by third parties?



    The reason I ask is that my university https://www.sydney.edu.au supposedly sent me a link in an email authored by notifications@instructure.com and this link directs me to https://canvas.sydney.edu.au/.



    This looks bad to me. But maybe DNS rules only allow https://www.sydney.edu.au
    to have the associated domain https://canvas.sydney.edu.au.



    Otherwise, if any person (e.g. a Bad Person) can register https://badsite.sydney.edu.au and DNS lets it go through... then there is a hole in the DNS world that is made for badness.






    dns dns-spoofing







    share|improve this question









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    Tony Barry is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      up vote
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      up vote
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      down vote

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      I have one of those questions that rely on the rule sets for DNS lookup.



      Let us say Person A owns the site https://www.example.com. A different person, Person B, not associated with A, attempts to register https://sub.example.com with the local registry. Will the registry allow this? Or is there an implicit understanding that these domain names are linked, and can't be obtained by third parties?



      The reason I ask is that my university https://www.sydney.edu.au supposedly sent me a link in an email authored by notifications@instructure.com and this link directs me to https://canvas.sydney.edu.au/.



      This looks bad to me. But maybe DNS rules only allow https://www.sydney.edu.au
      to have the associated domain https://canvas.sydney.edu.au.



      Otherwise, if any person (e.g. a Bad Person) can register https://badsite.sydney.edu.au and DNS lets it go through... then there is a hole in the DNS world that is made for badness.






      dns dns-spoofing







      share|improve this question









      New contributor




      Tony Barry is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.











      I have one of those questions that rely on the rule sets for DNS lookup.



      Let us say Person A owns the site https://www.example.com. A different person, Person B, not associated with A, attempts to register https://sub.example.com with the local registry. Will the registry allow this? Or is there an implicit understanding that these domain names are linked, and can't be obtained by third parties?



      The reason I ask is that my university https://www.sydney.edu.au supposedly sent me a link in an email authored by notifications@instructure.com and this link directs me to https://canvas.sydney.edu.au/.



      This looks bad to me. But maybe DNS rules only allow https://www.sydney.edu.au
      to have the associated domain https://canvas.sydney.edu.au.



      Otherwise, if any person (e.g. a Bad Person) can register https://badsite.sydney.edu.au and DNS lets it go through... then there is a hole in the DNS world that is made for badness.






      dns dns-spoofing




      dns dns-spoofing






      share|improve this question









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      Tony Barry is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
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      edited 2 hours ago









      Anders

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          The DNS registrars only care about the registration of the primary domain, i.e. example.com. They don't care about any sub-domains like www.example.com or www.math.example.com and similar. These are in full control of the organisation which owns the primary domain, which also might decide to delegate control over these domains or some of these domains to other parties.






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            The DNS registrars only care about the registration of the primary domain, i.e. example.com. They don't care about any sub-domains like www.example.com or www.math.example.com and similar. These are in full control of the organisation which owns the primary domain, which also might decide to delegate control over these domains or some of these domains to other parties.






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              The DNS registrars only care about the registration of the primary domain, i.e. example.com. They don't care about any sub-domains like www.example.com or www.math.example.com and similar. These are in full control of the organisation which owns the primary domain, which also might decide to delegate control over these domains or some of these domains to other parties.






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                up vote
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                up vote
                3
                down vote









                The DNS registrars only care about the registration of the primary domain, i.e. example.com. They don't care about any sub-domains like www.example.com or www.math.example.com and similar. These are in full control of the organisation which owns the primary domain, which also might decide to delegate control over these domains or some of these domains to other parties.






                share|improve this answer












                The DNS registrars only care about the registration of the primary domain, i.e. example.com. They don't care about any sub-domains like www.example.com or www.math.example.com and similar. These are in full control of the organisation which owns the primary domain, which also might decide to delegate control over these domains or some of these domains to other parties.







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                answered 2 hours ago









                Steffen Ullrich

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