DNS - Domain Name Space (NS)

Map Of Internet 1973


The domain name space is a name space for a DNS name that shows:

  • a tree structure (ie hierarchical)
  • where the hierarchy levels are separated by the dot character .

Each node on the tree corresponds to a resource set (which may be empty).

For more information, you should go to the DNS name page


Syntax as specified by the rfc: 1)

<domain> ::= <subdomain> | " "

<subdomain> ::= <label> | <subdomain> "." <label>

<label> ::= <letter> [ [ <ldh-str> ] <let-dig> ]

<ldh-str> ::= <let-dig-hyp> | <let-dig-hyp> <ldh-str>

<let-dig-hyp> ::= <let-dig> | "-"

<let-dig> ::= <letter> | <digit>

<letter> ::= any one of the 52 alphabetic characters A through Z in
upper case and a through z in lower case

<digit> ::= any one of the ten digits 0 through 9

Documentation / Reference

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What is DNS ? The Domain Name System

The Domain Name System (DNS) is a database of name. It's naming system (service). It holds naming information for some kind of object (not only but mainly host) DNS can be seen as the phone book of...
Map Of Internet 1973
What is a DNS Server (nameserver) ?

A nameserver is a server (host) where a name service (generally DNS) program is running generally on port 53. A name server is organized in namespace information unit called ZONEs that manages DNS...
Map Of Internet 1973
What is a Domain Name in DNS ?

The term domain name is a name: in the Domain NameSpace (DNS) that identifies an object (known also as node) in the domain database (ie a DNS database or a local host file) It's also known as...
Map Of Internet 1973
What is a network subdomain ?

In a domain name space, a domain is a subdomain of another domain if it is contained within that domain. This relationship can be tested by seeing if the subdomain's name ends with the containing domain's...

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