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: 217.0.8.0/21
Addresses: 2048 (2¹¹)
First IP: 217.0.8.0 (0.8.0.217.in-addr.arpa)
Last IP: 217.0.15.255 (255.15.0.217.in-addr.arpa)

/8 Operated By: RIPE NCC

Related Networks

217.0.0.0/8
216.0.0.0/8
218.0.0.0/8
217.0.0.0/20
217.0.8.0/32
217.0.15.255/32

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