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: 201.128.3.122/31
Addresses: 2 (2¹)
First IP: 201.128.3.122 (122.3.128.201.in-addr.arpa)
Last IP: 201.128.3.123 (123.3.128.201.in-addr.arpa)

/8 Operated By: LACNIC

Related Networks

201.0.0.0/8
200.0.0.0/8
202.0.0.0/8
201.128.3.120/30
201.128.3.122/32
201.128.3.123/32

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