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: 191.0.0.128/31
Addresses: 2 (2¹)
First IP: 191.0.0.128 (128.0.0.191.in-addr.arpa)
Last IP: 191.0.0.129 (129.0.0.191.in-addr.arpa)

/8 Operated By: LACNIC

Related Networks

191.0.0.0/8
190.0.0.0/8
192.0.0.0/8
191.0.0.128/30
191.0.0.128/32
191.0.0.129/32

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