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: 172.128.2.0/23
Addresses: 512 (2⁹)
First IP: 172.128.2.0 (0.2.128.172.in-addr.arpa)
Last IP: 172.128.3.255 (255.3.128.172.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

172.0.0.0/8
171.0.0.0/8
173.0.0.0/8
172.128.0.0/22
172.128.2.0/32
172.128.3.255/32

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