Subnet / CIDR Calculator
Enter an IPv4 address with a CIDR prefix and get the full breakdown of the subnet: network address, broadcast address, usable host range, subnet mask, wildcard mask and the total number of addresses. Subnetting math is easy to get wrong under pressure, and one off-by-one on the host range can mean a misconfigured firewall rule or a wasted afternoon. This calculator does the bitwise work for you and lays out every value you typically need when planning address space or reading a network diagram. Type something like 192.168.1.10/24 and read off the results. All calculations happen in your browser with no lookups, so your addressing plans stay entirely private.
How to use Subnet / CIDR Calculator
- Enter an IP address with its CIDR prefix.
- Read the network and broadcast addresses.
- Check the usable host range and total hosts.
Frequently asked questions
What do I enter to calculate a subnet?
You enter an IPv4 address together with a CIDR prefix such as /24, and the tool computes the network details from that.
What results does it give?
It returns the network address, broadcast address, usable host range, subnet mask and the total number of hosts in the block.
How many usable hosts does a /24 have?
A /24 has 256 total addresses and 254 usable hosts, since the network and broadcast addresses are reserved.
What is Subnet / CIDR Calculator?
Enter an IPv4 address with a CIDR prefix and get the full breakdown of the subnet: network address, broadcast address, usable host range, subnet mask, wildcard mask and the total number of addresses. Subnetting math is easy to get wrong under pressure, and one off-by-one on the host range can mean a misconfigured firewall rule or a wasted afternoon.
Is Subnet / CIDR Calculator free to use?
Yes. Subnet / CIDR Calculator is completely free, with no sign-up and no usage limits.
Does Subnet / CIDR Calculator work in a web browser?
Yes. Subnet / CIDR Calculator runs in any modern web browser. There is nothing to download or install.
Is my data private with Subnet / CIDR Calculator?
Yes. Subnet / CIDR Calculator runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
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