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: 77.128.31.40/30
Addresses: 4 (2²)
First IP: 77.128.31.40 (40.31.128.77.in-addr.arpa)
Last IP: 77.128.31.43 (43.31.128.77.in-addr.arpa)

/8 Operated By: RIPE NCC

Related Networks

77.0.0.0/8
76.0.0.0/8
78.0.0.0/8
77.128.31.40/29
77.128.31.40/32
77.128.31.43/32

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