--- a/net.rst	Tue Dec 05 23:51:54 2017 +0200
+++ b/net.rst	Thu Dec 14 01:20:06 2017 +0200
@@ -94,6 +94,15 @@
 
   $ sudo netstat -tulpn
 
+Windows predefined ports:
+
+https://support.microsoft.com/en-us/help/832017/service-overview-and-network-port-requirements-for-windows
+  Service overview and network port requirements for Windows
+https://msdn.microsoft.com/en-us/library/cc875824.aspx
+  Network Ports Used by Key Microsoft Server Products
+https://msdn.microsoft.com/en-us/library/cc959833.aspx
+  Port Assignments for Commonly-Used Services
+
 Which processes open port
 =========================