This is a quick tip for the situations where you are building a function with an IP address parameter. There are many ways of validating that a valid IP address are filled out, but this is by far the easiest.

function Invoke-MyFunction {
    [CmdletBinding()]
    param (
        [Parameter()]
        [ipaddress] $IPAddress
    )
    Write-Output $IPAddress
}

That’s it. Only a valid IP address are now allowed in the -IPAddress parameter.