MAC to manufacturer

Get-Manufacturer.ps1

function Update-ManufacturerList {
    <#
    .SYNOPSIS
      Updates the cached manufacturer list maintained by the IEEE.
    .DESCRIPTION
      Update-ManufacturerList attempts to download the assigned list of MAC address prefixes using Get-WebContent.
       
      The return is converted into an XML format to act as the cache file for Get-Manufacturer.
    .PARAMETER Source
       By default, the manufacturer list is downloaded from http://standards.ieee.org/develop/regauth/oui/oui.txt. An alternate source may be specified if required.
    .INPUTS
      System.String
    .EXAMPLE
      Update-ManufacturerList
    .NOTES
      Author: Chris Dent
    
      Change log:
        02/04/2015 - Chris Dent - Refactored.
        08/05/2013 - Chris Dent - Created.
    #>
  
    [CmdletBinding()]
    param(
        [String]$Source = "http://standards-oui.ieee.org/oui.txt"
    )
 
    $Writer = New-Object IO.StreamWriter("$psscriptroot\..\var\oui.xml")
    $Writer.WriteLine("<?xml version='1.0'?>")
    $Writer.WriteLine("<Manufacturers>")
  
    Get-WebContent $Source -UseSystemProxy |
    ForEach-Object {
        switch -regex ($_) {
            '^\s*([0-9A-F]{2}-[0-9A-F]{2}-[0-9A-F]{2})\s+\(hex\)[\s\t]*(.+)$' {
                $OUI = $matches[1]
                $Organisation = $matches[2]
                break
            }
            '^\s*([0-9A-F]{6})\s+\(base 16\)[\s\t]*(.+)$' { 
                $CompanyID = $matches[1]
                [Array]$Address = $matches[2]
                break
            }
            '^\s+(\S+.+)$' {
                $Address += $matches[1]
                break
            }
            '^\s*$' {
                if ($OUI -and $Organisation) {
                    $Writer.WriteLine("<Manufacturer>")
                    $Writer.WriteLine("<OUI>$OUI</OUI>")
                    $Writer.WriteLine("<Organization><![CDATA[$Organisation]]></Organization>")
                    $Writer.WriteLine("<CompanyId>$CompanyID</CompanyId>")
                    $Writer.WriteLine("<Address><![CDATA[$($Address -join ', ')]]></Address>")
                    $Writer.WriteLine("</Manufacturer>")
                }
                $OUI = $null; $Organisation = $null; $CompanyID = $null; $Address = $null
            }
        }
    }
    
    $Writer.WriteLine("</Manufacturers>")
    $Writer.Close()
}

function Get-Manufacturer {
    <#
    .SYNOPSIS
      Get the manufacturer associated with a MAC address.
    .DESCRIPTION
      Get-Manufacturer attempts to find a manufacturer for a given MAC address. The list of manufacturers is cached locally in XML format, the function Update-ManufacturerList is used to populate and update the cached list.
    .PARAMETER MACAddress
      A partial or full MAC address, with or without delimiters. Accepted delimiters are ., - and :.
    .INPUTS
      System.String
    .OUTPUTS
      System.Object
    .EXAMPLE
      Get-Manufacturer 00:00:00:00:00:01
    .EXAMPLE
      Get-Manufacturer 000000000001
    .EXAMPLE
      Get-Manufacturer 00-00-00
    .NOTES
      Author: Chris Dent
    
      Change log:
        02/04/2015 - Chris Dent - Updated to use Indented.Common XPath CmdLets.
        08/05/2013 - Chris Dent - Created.
    #>
  
    [CmdletBinding()]
    param(
        [Parameter(Mandatory = $true, ValueFromPipeLine = $true, ValueFromPipelineByPropertyname = $true)]
        [ValidatePattern('^([0-9A-Z]{2}[.\-:]?){2,5}([0-9A-Z]{2})')]
        [String]$MACAddress
    )
  
    process {
        $MACAddress -match '([0-9A-Z]{2})[.\-:]?([0-9A-Z]{2})[.\-:]?([0-9A-Z]{2})' | Out-Null
        $OUI = [String]::Format("{0}-{1}-{2}", $matches[1], $matches[2], $matches[3]).ToUpper()
  
        $FilePath = "$psscriptroot\..\var\oui.xml"
    
        if (Test-Path $FilePath) {
            $XPathNavigator = New-XPathNavigator $FilePath
      
            $XPathNavigator.Select("/Manufacturers/Manufacturer[OUI='$OUI']") |
            ForEach-Object {
                $_ | ConvertFrom-XPathNode -ToObject
            }
        }
        else {
            Write-Warning "Get-Manufacturer: The manufacturer list does not exist. Run Update-ManufacturerList to create."
        }
    }
}