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: 223.0.31.128/25
Addresses: 128 (2⁷)
First IP: 223.0.31.128 (128.31.0.223.in-addr.arpa)
Last IP: 223.0.31.255 (255.31.0.223.in-addr.arpa)

/8 Operated By: APNIC

Related Networks

223.0.0.0/8
222.0.0.0/8
224.0.0.0/8
223.0.31.0/24
223.0.31.128/32
223.0.31.255/32

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