Domain names

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IDNs

IDNs need to be encoded.

Correct: xn--mnchen-3ya.de
Wrong: münchen.de

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Root domain delimiter

For all domains the root domain delimiter (trailing dot) is omitted.

Correct: example.net (without trailing dot)
Wrong: example.net. (with trailing dot)

Examples

Hostname

Apex Domain

Domain

Sub Domain

Suffix

TLD

example.net

example.net

example

(empty string)

net

net

www.example.net

example.net

example

www

net

net

sub1.sub2.example.net

example.net

example

sub1.sub2

net

net

sub1.sub2.sub3.example.net

example.net

example

sub1.sub2.sub3

net

net

www.example.co.uk

example.co.uk

example

www

co.uk

uk

sub.cloud.fedoraproject.org

fedoraproject.org

fedoraproject

sub.cloud

org

org

Hostname

A fully qualified domain name (FQDN)

Apex Domain

Domains that are able to be registered from a registrar.

Domain

An APEX domain minus the suffix.

Sub Domain

A hostname minus the APEX domain.

Suffix

Apex domain without the domain.

Examples

  • co.uk
  • com

TLD

The last label of the hostname.

Example
uk