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: 51.0.0.0/12
Addresses: 1048576 (2²⁰)
First IP: 51.0.0.0 (0.0.0.51.in-addr.arpa)
Last IP: 51.15.255.255 (255.255.15.51.in-addr.arpa)

/8 Operated By: RIPE NCC

Related Networks

51.0.0.0/8
50.0.0.0/8
52.0.0.0/8
51.0.0.0/11
51.0.0.0/32
51.15.255.255/32

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