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: 100.0.12.48/31
Addresses: 2 (2¹)
First IP: 100.0.12.48 (48.12.0.100.in-addr.arpa)
Last IP: 100.0.12.49 (49.12.0.100.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

100.0.0.0/8
99.0.0.0/8
101.0.0.0/8
100.0.12.48/30
100.0.12.48/32
100.0.12.49/32

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