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: 101.128.4.28/31
Addresses: 2 (2¹)
First IP: 101.128.4.28 (28.4.128.101.in-addr.arpa)
Last IP: 101.128.4.29 (29.4.128.101.in-addr.arpa)

/8 Operated By: APNIC

Related Networks

101.0.0.0/8
100.0.0.0/8
102.0.0.0/8
101.128.4.28/30
101.128.4.28/32
101.128.4.29/32

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