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: 101.0.0.66/32
Addresses: 1 (2⁰)
First IP: 101.0.0.66 (66.0.0.101.in-addr.arpa)
Last IP: 101.0.0.66 (66.0.0.101.in-addr.arpa)

/8 Operated By: APNIC

Related Networks

101.0.0.0/8
100.0.0.0/8
102.0.0.0/8
101.0.0.66/31

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