CLI:
curl "https://macaddresslookup.info/lookup/?mac=08-00-27-00-08-CA"

PHP:
<?php 

$mac = "08-00-27-00-08-CA";

$curl = curl_init("https://macaddresslookup.info/lookup/?mac=$mac");
@curl_setopt($curl, CURLOPT_RETURNTRANSFER ,true);
$resp = curl_exec($curl);
curl_close($curl);

echo "$resp";
?>

A POST to https://macaddresslookup.info/lookup/bulk/ with a JSON formatted payload:


{
    "mac_addresses": ["00:A0:C9:14:C8:29", "00-1B-63-AB-12-CD", "00D0B7AABBCC"]
}


Will return a JSON formatted response for each:


{
    "success": true,
    "count": 3,
    "results": [
        {
            "mac_address": "00:A0:C9:14:C8:29",
            "valid": true,
            "vendor": "Intel"
        },
        {
            "mac_address": "00:1B:63:AB:12:CD",
            "valid": true,
            "vendor": "Apple"
        },
        {
            "mac_address": "00:D0:B7:AA:BB:CC",
            "valid": true,
            "vendor": "Intel"
        }
    ]
}