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: 192.128.3.0/24
Addresses: 256 (2⁸)
First IP: 192.128.3.0 (0.3.128.192.in-addr.arpa)
Last IP: 192.128.3.255 (255.3.128.192.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

192.0.0.0/8
191.0.0.0/8
193.0.0.0/8
192.128.2.0/23
192.128.3.0/32
192.128.3.255/32

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