diff --git a/api/ports.js b/api/ports.js
index 6cef48d..5fc64a2 100644
--- a/api/ports.js
+++ b/api/ports.js
@@ -2,12 +2,17 @@ import net from 'net';
 import middleware from './_common/middleware.js';
 
 // A list of commonly used ports.
-const PORTS = [
+const DEFAULT_PORTS_TO_CHECK = [
   20, 21, 22, 23, 25, 53, 80, 67, 68, 69,
   110, 119, 123, 143, 156, 161, 162, 179, 194,
   389, 443, 587, 993, 995,
   3000, 3306, 3389, 5060, 5900, 8000, 8080, 8888
 ];
+/*
+ * Checks if the env PORTS_TO_CHECK is set, if so the string is split via "," to get an array of ports to check.
+ * If the env is not set, return the default commonly used ports.
+ */
+const PORTS = process.env.PORTS_TO_CHECK ? process.env.PORTS_TO_CHECK.split(",") : DEFAULT_PORTS_TO_CHECK
 
 async function checkPort(port, domain) {
     return new Promise((resolve, reject) => {