Test-DnsNameResolution

1.1

Test-DnsNameResolution.ps1


<#PSScriptInfo
 
.VERSION 1.1
 
.GUID e2603db1-b42d-4456-84f8-6031a8d247fd
 
.AUTHOR Adam Bertram
 
.COMPANYNAME Adam the Automator, LLC
 
.COPYRIGHT
 
.TAGS
 
.LICENSEURI
 
.PROJECTURI
 
.ICONURI
 
.EXTERNALMODULEDEPENDENCIES
 
.REQUIREDSCRIPTS
 
.EXTERNALSCRIPTDEPENDENCIES
 
.RELEASENOTES
 
 
#>

<#
 
.DESCRIPTION
 A script to test if a DNS name can be resolved.
 
#> 
[CmdletBinding()]
param
(
    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string]$Name,
    
    [Parameter(Mandatory)]
    [ValidateNotNullOrEmpty()]
    [string]$Server
)

$resolvParams = @{
    'Server' = $Server
    'DnsOnly' = $true
    'NoHostsFile' = $true
    'ErrorAction' = 'SilentlyContinue'
    'ErrorVariable' = 'err'
    'Name' = $Name
}
try
{
    if (Resolve-DnsName @resolvParams)
    {
        $true
    }
    elseif ($err -and ($err.Exception.Message -match '(DNS name does not exist)|(No such host is known)'))
    {
        $false
    }
    else
    {
        throw $err
    }
}
catch
{
    if ($_.Exception.Message -match 'No such host is known')
    {
        $false
    }
    else
    {
        throw $_    
    }
}