diff --git a/src/Check.php b/src/Check.php
new file mode 100644
index 0000000..4842b95
--- /dev/null
+++ b/src/Check.php
@@ -0,0 +1,15 @@
+<?php
+
+require_once 'Process.php';
+
+function kmsCheck(string $host, int $port = 1688): bool {
+    # TODO: ipv6 host add bracket
+    $vlmcs = new Process(['vlmcs', $host . ':' . $port], $capture = true);
+    while($vlmcs->isAlive()); // wait vlmcs exit
+    preg_match_all('/Sending activation request \(KMS V6\)/', $vlmcs->getStdout(), $match);
+    return count($match[0]) != 0;
+}
+
+$host = 'kms.343.re';
+echo "check $host -> ";
+echo (kmsCheck($host) ? 'yes' : 'no') . PHP_EOL;