Azure Trigger PowerShell Function to lookup Vendor/Manufacturer. Associated Blog Post can be found here https://blog.darrenjrobinson.com/an-azure-powershell-trigger-function-for-mac-address-vendor-manufacturer-lookup/

MACAddress Vendor Lookup.ps1

$requestBody = Get-Content $req -Raw | ConvertFrom-Json
$query = $requestBody.query
$query
if ($query) 
{
    # LOAD MAC Address to Vendors PSObjects
    $vendors = Import-Clixml -Path "D:\home\site\wwwroot\YOURAZUREFUNCTION\Vendors.xml"
    $output = $null    
    $response = $null 
    if ($query.Contains("-")) {
        $response = $vendors | Select-Object  | Where-Object {$_.hex -eq $query}
        if ($response){
            $output = (Get-Culture).textinfo.totitlecase($response.vendor.tolower())
        }
    }
    else {
        $response = $vendors | Select-Object  | Where-Object {$_.base16 -eq $query}
        if ($response){
            $output = (Get-Culture).textinfo.totitlecase($response.vendor.tolower())
        }
    }
}

if ($output) {
    $output
    Out-File -Encoding ASCII -FilePath $res -inputObject $output    
} else {
    $output = "MACAddress Vendor not found"
    $output
    Out-File -Encoding ASCII -FilePath $res -inputObject $output
}