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: 247.128.3.128/31
Addresses: 2 (2¹)
First IP: 247.128.3.128 (128.3.128.247.in-addr.arpa)
Last IP: 247.128.3.129 (129.3.128.247.in-addr.arpa)

Owned By: IANA (Reserved (Future Use))
/8 Operated By: IANA (Reserved (Future Use))

Related Networks

247.0.0.0/8
246.0.0.0/8
248.0.0.0/8
247.128.3.128/30
247.128.3.128/32
247.128.3.129/32

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