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: 18.255.128.4/31
Addresses: 2 (2¹)
First IP: 18.255.128.4 (4.128.255.18.in-addr.arpa)
Last IP: 18.255.128.5 (5.128.255.18.in-addr.arpa)

/8 Operated By: ARIN

Related Networks

18.0.0.0/8
17.0.0.0/8
19.0.0.0/8
18.255.128.4/30
18.255.128.4/32
18.255.128.5/32

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