Get IP vitals in PHP

<?php
$ip = '';
$ch = curl_init();

    curl_setopt($ch, CURLOPT_URL, 'http://whois.arin.net/rest/ip/' . $ip);
    curl_setopt($ch, CURLOPT_HEADER, 0);
    curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
    curl_setopt($ch, CURLOPT_HTTPHEADER, array('Accept: application/json'));

    $returnValue = curl_exec($ch);

    curl_close($ch);

    $result = json_decode($returnValue);
    $rdns = gethostbyaddr($ip);

echo $rdns;
echo $result->net->name->{'$'};
echo $result->net->orgRef->{'@name'};
?>

Output:
cpe-24-92-*-*.nycap.res.rr.com
Name: ROAD-RUNNER-3
OrgRef: Road Runner HoldCo LLC