# Get-MtRegistrableDomain

Get the registrable domain for a given domain name.

Source: https://maester.dev/docs/commands/Get-MtRegistrableDomain

## SYNOPSIS

Get the registrable domain for a given domain name.

## SYNTAX

```powershell
Get-MtRegistrableDomain [-DomainName] <String> [-ProgressAction <ActionPreference>] [<CommonParameters>]
```

## DESCRIPTION

This function retrieves the registrable domain for a given domain name based on the public suffix list.
Uses a cached version of the public suffix list for performance reasons.
Public suffix list is sourced from https://publicsuffix.org/ and stored in the Maester powershell assets repository.

## EXAMPLES

### EXAMPLE 1

```powershell
Get-MtRegistrableDomain -DomainName "sub.example.co.uk"
Returns "example.co.uk".
```

### EXAMPLE 2

```powershell
Get-MtRegistrableDomain -DomainName "example.co.uk"
Returns "example.co.uk".
```

### EXAMPLE 3

```powershell
Get-MtRegistrableDomain -DomainName "sub.example.com"
Returns "example.com".
```

### EXAMPLE 4

```powershell
Get-MtRegistrableDomain -DomainName "example.com"
Returns "example.com".
```

## PARAMETERS

### -DomainName

The domain name for which to retrieve the registrable domain.

```yaml
Type: String
Parameter Sets: (All)
Aliases:

Required: True
Position: 1
Default value: None
Accept pipeline input: False
Accept wildcard characters: False
```

### -ProgressAction

Determines how PowerShell responds to progress updates generated by a script, cmdlet, or provider, such as the progress bars generated by Write-Progress.

```yaml
Type: ActionPreference
Parameter Sets: (All)
Aliases: proga

Required: False
Position: Named
Default value: None
Accept pipeline input: False
Accept wildcard characters: False
```

### CommonParameters

This cmdlet supports the common parameters: -Debug, -ErrorAction, -ErrorVariable, -InformationAction, -InformationVariable, -OutVariable, -OutBuffer, -PipelineVariable, -Verbose, -WarningAction, and -WarningVariable. For more information, see [about_CommonParameters](http://go.microsoft.com/fwlink/?LinkID=113216).

## INPUTS

## OUTPUTS

### System.String

## NOTES

## RELATED LINKS

[https://maester.dev/docs/commands/Get-MtRegistrableDomain](https://maester.dev/docs/commands/Get-MtRegistrableDomain)