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: 91.0.63.20/31
Addresses: 2 (2¹)
First IP: 91.0.63.20 (20.63.0.91.in-addr.arpa)
Last IP: 91.0.63.21 (21.63.0.91.in-addr.arpa)

/8 Operated By: RIPE NCC

Related Networks

91.0.0.0/8
90.0.0.0/8
92.0.0.0/8
91.0.63.20/30
91.0.63.20/32
91.0.63.21/32

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