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: 6.3.128.0/23
Addresses: 512 (2⁹)
First IP: 6.3.128.0 (0.128.3.6.in-addr.arpa)
Last IP: 6.3.129.255 (255.129.3.6.in-addr.arpa)

/8 Operated By: Army Information Systems Center

Related Networks

6.0.0.0/8
5.0.0.0/8
7.0.0.0/8
6.3.128.0/22
6.3.128.0/32
6.3.129.255/32

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