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: 15.0.121.248/31
Addresses: 2 (2¹)
First IP: 15.0.121.248 (248.121.0.15.in-addr.arpa)
Last IP: 15.0.121.249 (249.121.0.15.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

15.0.0.0/8
14.0.0.0/8
16.0.0.0/8
15.0.121.248/30
15.0.121.248/32
15.0.121.249/32

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