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: 168.0.0.40/31
Addresses: 2 (2¹)
First IP: 168.0.0.40 (40.0.0.168.in-addr.arpa)
Last IP: 168.0.0.41 (41.0.0.168.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

168.0.0.0/8
167.0.0.0/8
169.0.0.0/8
168.0.0.40/30
168.0.0.40/32
168.0.0.41/32

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