How do I subnet an IPv4 address?

Choose a prefix length that fits your host count, apply that mask to the IP to find the network ID, then derive broadcast and usable hosts. Enter the IP and CIDR here to check your manual work.

What is the network address of an IPv4 address?

It is the first address in the subnet, found by ANDing the IP with the subnet mask. For 192.168.1.37/24 the network address is 192.168.1.0.

How do I calculate usable IPv4 hosts?

Usable hosts = 2^(32 − prefix) − 2 on a normal LAN. A /24 has 254 usable hosts; a /30 has 2.

How do I find the first and last usable IP?

First usable is usually network + 1. Last usable is usually broadcast − 1. This calculator lists both for every valid IPv4 subnet you enter.

Can I calculate multiple IPv4 subnets?

This page calculates one subnet at a time. For unequal blocks from one parent network, use our VLSM calculator.

What is IPv4 Subnet Calculator?

A free online tool that returns network, broadcast, mask, CIDR, and usable host details for an IPv4 address, built for beginners through network administrators.

How does the IPv4 Subnet Calculator work?

It converts your mask or CIDR into a 32-bit pattern, applies it to the IP, then computes network, broadcast, and host counts in your browser.

How do I use the IPv4 Subnet Calculator?

Type an IPv4 address and a prefix or mask, or tap an example chip. Results update instantly on desktop and mobile.

Is this IPv4 Subnet Calculator free to use?

Yes. It is free with no sign-up for CCNA students, IT students, engineers, and home-lab use.

Can I use the IPv4 Subnet Calculator on mobile?

Yes. The page is responsive and works in mobile browsers for quick subnet checks.

Free IPv4 Subnet Calculator Online, CIDR & Host Ranges

Free IPv4 Subnet Calculator Online, CIDR & Host Ranges | Binary Tech