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: 30.0.128.40/31
Addresses: 2 (2¹)
First IP: 30.0.128.40 (40.128.0.30.in-addr.arpa)
Last IP: 30.0.128.41 (41.128.0.30.in-addr.arpa)

/8 Operated By: Defense Information Systems Agency

Related Networks

30.0.0.0/8
29.0.0.0/8
31.0.0.0/8
30.0.128.40/30
30.0.128.40/32
30.0.128.41/32

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