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: 166.255.243.216/31
Addresses: 2 (2¹)
First IP: 166.255.243.216 (216.243.255.166.in-addr.arpa)
Last IP: 166.255.243.217 (217.243.255.166.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

166.0.0.0/8
165.0.0.0/8
167.0.0.0/8
166.255.243.216/30
166.255.243.216/32
166.255.243.217/32

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