IPv4 Subnet Calculator

This calculator and tool allows you to type an IP address in and get information on a particular subnet. Enter an IP or range in CIDR notation.

Network: 11.128.3.255/32
Addresses: 1 (2⁰)
First IP: 11.128.3.255 (255.3.128.11.in-addr.arpa)
Last IP: 11.128.3.255 (255.3.128.11.in-addr.arpa)

/8 Operated By: Department of Defense Intel Information Systems

Related Networks

11.0.0.0/8
10.0.0.0/8
12.0.0.0/8
11.128.3.254/31

You can also use some of the other examples such as:

0.0.0.0/0
1.0.0.0/8
127.0.0.1
30.0.0.0/8
192.168.0.0/16