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: 248.128.3.242/31
Addresses: 2 (2¹)
First IP: 248.128.3.242 (242.3.128.248.in-addr.arpa)
Last IP: 248.128.3.243 (243.3.128.248.in-addr.arpa)

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

Related Networks

248.0.0.0/8
247.0.0.0/8
249.0.0.0/8
248.128.3.240/30
248.128.3.242/32
248.128.3.243/32

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