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: 207.128.4.0/23
Addresses: 512 (2⁹)
First IP: 207.128.4.0 (0.4.128.207.in-addr.arpa)
Last IP: 207.128.5.255 (255.5.128.207.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

207.0.0.0/8
206.0.0.0/8
208.0.0.0/8
207.128.4.0/22
207.128.4.0/32
207.128.5.255/32

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