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: 37.0.121.128/31
Addresses: 2 (2¹)
First IP: 37.0.121.128 (128.121.0.37.in-addr.arpa)
Last IP: 37.0.121.129 (129.121.0.37.in-addr.arpa)

/8 Operated By: RIPE NCC

Related Networks

37.0.0.0/8
36.0.0.0/8
38.0.0.0/8
37.0.121.128/30
37.0.121.128/32
37.0.121.129/32

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