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: 100.255.255.12/31
Addresses: 2 (2¹)
First IP: 100.255.255.12 (12.255.255.100.in-addr.arpa)
Last IP: 100.255.255.13 (13.255.255.100.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

100.0.0.0/8
99.0.0.0/8
101.0.0.0/8
100.255.255.12/30
100.255.255.12/32
100.255.255.13/32

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