Returns Public IP info from ip.nf Can be ran on remote computers

Get-PublicIPInfo.ps1

function Get-PublicIPInfo {
    <#
.Description
    Returns Public IP info from ip.nf
.Parameter IPAddress
    Supply an IP address that you would like to lookup.
.Parameter ComputerName
    Names of computers to run this command on.
.Parameter Credential
    Credential used by Invoke-Command when performing the lookup on a remote machine.
.Example
    PS> Get-PublicIPInfo
    Returns your public IP info
.Example
    PS> $computers = Import-Csv c:\computers.csv
    PS> $computers | Get-PublicIpInfo -Credential $Cred
    Grabs a list of computernames from csv.
    Sends these computernames and invokes the lookup using the provided credential.
#>
    [cmdletbinding(DefaultParameterSetName = '__AllParameterSets')]
    param(
        [Parameter(ParameterSetName = 'IP', Mandatory)]
        $IPAddress,

        [Parameter(ParameterSetName = 'Invoke', ValueFromPipeline, Mandatory)]
        [string[]]
        $ComputerName,

        [Parameter(ParameterSetName = 'Invoke')]
        [pscredential]
        $Credential
    )
    process {
        Switch ($PSCmdlet.ParameterSetName) {
            
            '__AllParameterSets' {
                (Invoke-RestMethod 'https://ip.nf/me.json').ip
            }

            'Invoke' {
                Write-Verbose "Processing $($computername.count) computers" -verbose
                foreach ($computer in $ComputerName) {
                    Write-Verbose "querying $computer" -verbose
                    $icmParams = @{
                        Computername = $computer
                        ScriptBlock  = {
                            (Invoke-RestMethod 'https://ip.nf/me.json').ip }
                    }
                    if ($Credential) { $icmParams['Credential'] = $Credential }
                    Invoke-Command @icmParams
                }
            }

            'IP' {
                foreach ($Ip in $IPAddress) {
                    (Invoke-RestMethod "https://ip.nf/$IP.json").ip
                }
            }
        }
    }
}