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: 0.128.123.254/31
Addresses: 2 (2¹)
First IP: 0.128.123.254 (254.123.128.0.in-addr.arpa)
Last IP: 0.128.123.255 (255.123.128.0.in-addr.arpa)

/8 Operated By: IANA (Local Identification)

Related Networks

0.0.0.0/8
1.0.0.0/8
0.128.123.252/30
0.128.123.254/32
0.128.123.255/32

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