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: 133.128.4.120/31
Addresses: 2 (2¹)
First IP: 133.128.4.120 (120.4.128.133.in-addr.arpa)
Last IP: 133.128.4.121 (121.4.128.133.in-addr.arpa)

/8 Operated By: APNIC

Related Networks

133.0.0.0/8
132.0.0.0/8
134.0.0.0/8
133.128.4.120/30
133.128.4.120/32
133.128.4.121/32

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