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: 40.255.128.0/20
Addresses: 4096 (2¹²)
First IP: 40.255.128.0 (0.128.255.40.in-addr.arpa)
Last IP: 40.255.143.255 (255.143.255.40.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

40.0.0.0/8
39.0.0.0/8
41.0.0.0/8
40.255.128.0/19
40.255.128.0/32
40.255.143.255/32

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