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: 228.128.120.0/21
Addresses: 2048 (2¹¹)
First IP: 228.128.120.0 (0.120.128.228.in-addr.arpa)
Last IP: 228.128.127.255 (255.127.128.228.in-addr.arpa)

/8 Operated By: Multicast

Related Networks

228.0.0.0/8
227.0.0.0/8
229.0.0.0/8
228.128.112.0/20
228.128.120.0/32
228.128.127.255/32

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