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: 255.128.3.12/30
Addresses: 4 (2²)
First IP: 255.128.3.12 (12.3.128.255.in-addr.arpa)
Last IP: 255.128.3.15 (15.3.128.255.in-addr.arpa)

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

Related Networks

255.0.0.0/8
254.0.0.0/8
255.128.3.8/29
255.128.3.12/32
255.128.3.15/32

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