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: 137.128.0.0/15
Addresses: 131072 (2¹⁷)
First IP: 137.128.0.0 (0.0.128.137.in-addr.arpa)
Last IP: 137.129.255.255 (255.255.129.137.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

137.0.0.0/8
136.0.0.0/8
138.0.0.0/8
137.128.0.0/14
137.128.0.0/32
137.129.255.255/32

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