Notes on Domain Name Servers

DNS are hierarchical.

The structure of a domain’s servers is up to the manager of the domain.

Each server must know about all of the servers below it in the hierarchy.

A server must also know a root server to ask when it doesn’t know the name.


There are two basic types of requests that can be sent to a DNS.

A server has different types of entries:


Further information on Domain Name Servers can be found at