IP Address
Subnet Mask

You may enter the subnet mask in either dotted decimal notation or in CIDR format as a number of bits, such as /28 or /24.

Component Decimal Dot Notation 8 Bit Binary Notation
IP ...
Subnet Mask ...
Network Address ...
Broadcast Address ...
First Useable IP ...
Last Useable IP ...

The WebGnuru Simple Subnet Calculator is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.