Variable Length Subnet Mask (VLSM) Calculator

This calculator enables you to determine: Note 1: If the network mask is specified by both dotted decimal and length, the length is ignored.
Note 2: This calculator assumes classful addressing (not CIDR).
 IP address:
 Network mask (dotted decimal):
 OR
 Length of network mask (# of bits):
 Print all subnet numbers:


 Return to non-mobile main page

Copyright © 1996-2007, DarinDavis.net. All rights reserved.