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: 215.0.1.128/31
Addresses: 2 (2¹)
First IP: 215.0.1.128 (128.1.0.215.in-addr.arpa)
Last IP: 215.0.1.129 (129.1.0.215.in-addr.arpa)

/8 Operated By: US Department of Defense

Related Networks

215.0.0.0/8
214.0.0.0/8
216.0.0.0/8
215.0.1.128/30
215.0.1.128/32
215.0.1.129/32

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