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: 138.3.255.128/31
Addresses: 2 (2¹)
First IP: 138.3.255.128 (128.255.3.138.in-addr.arpa)
Last IP: 138.3.255.129 (129.255.3.138.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

138.0.0.0/8
137.0.0.0/8
139.0.0.0/8
138.3.255.128/30
138.3.255.128/32
138.3.255.129/32

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