Gets location information about the ip address of a local or remote computer by calling a public web service that performs ip geolocation. This function currently only supports IPv4 addresses.

Get-PublicIP.ps1

#.SYNOPSIS
# Gets location information about the ip address of a local or remote computer
# by calling a public web service that performs ip geolocation.
# This function currently only supports IPv4 addresses.
function Get-PublicIP {

    [CmdletBinding()]
    param(

        # The IP address to get location information for.
        # Leave blank to get the public IP of the machine
        # running the query. Use the ComputerName parameter
        # to run the query on a remote computer via remoting.
        [Parameter(Position=1)]
        [IPAddress]$IPAddress,

        # If specified, the lookup is performed on a remote
        # computer using PowerShell remoting, which must be
        # properly setup and authenticated.
        [Parameter()]
        [String]$ComputerName

    )
    process {

        # Call the IP geolocation IP
        # If computername was specified, then issue the web request from the
        # remote computer.
        $Response = $(
            $ScriptBlock = { Invoke-RestMethod http://ip-api.com/json/$IPAddress }
            if ($ComputerName) { Invoke-Command -ComputerName $ComputerName -ScriptBlock $ScriptBlock }
            else { Invoke-ScriptBlock -ScriptBlock $ScriptBlock }
        )

        # If we got a valid response, proceed to reverse DNS
        if ($Response.query -match "(\d+\.){3}\d+") {

            # Format the IP address and location of the
            # response depending on whether it's a US or foreign IP
            $IP = [IPAddress]$Response.query
            $Location = "{0}, {1}" -f ($Response.city, $Response.country)
            if ($Response.countryCode -eq 'US') {
                $Location = "{0}, {1}" -f ($Response.city, $Response.region)
            }

            # Attempt to do a reverse DNS lookup.
            # If it fails, the IP address will be used instead.
            $HostName = $IP.ToString()
            try { $HostName = [System.Net.Dns]::GetHostEntry($IP).HostName }
            catch { }

            # Construct an object to return to the pipeline
            [PSCustomObject]@{
                PSComputerName = $Response.PSComputerName
                IPAddress = $IP
                HostName = $HostName
                Location = $Location
                ISP = $Response.isp
                Organization = $Response.org
            }

        }
        else {

            Write-Error "Error getting IP info."

        }

    }

}