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: 23.1.255.128/25
Addresses: 128 (2⁷)
First IP: 23.1.255.128 (128.255.1.23.in-addr.arpa)
Last IP: 23.1.255.255 (255.255.1.23.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

23.0.0.0/8
22.0.0.0/8
24.0.0.0/8
23.1.255.0/24
23.1.255.128/32
23.1.255.255/32

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