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Kordu Tools

Subnet Calculator

Calculate network address, broadcast, host range, and more from CIDR notation.

/24

Address details

CIDR Notation192.168.1.0/24
Network Address192.168.1.0
Broadcast Address192.168.1.255
First Usable Host192.168.1.1
Last Usable Host192.168.1.254
IP ClassC

Host details

Total Hosts256
Usable Hosts254

Mask details

Subnet Mask255.255.255.0
Wildcard Mask0.0.0.255

Binary subnet mask

11111111 11111111 11111111 00000000

How to use

  1. 1

    Enter an IP address

    Type any valid IPv4 address into the input field. The calculator accepts standard dotted-decimal notation.

  2. 2

    Select a CIDR prefix

    Choose a prefix length from /0 to /32 using the dropdown, or click a common preset like /24 or /16.

  3. 3

    Review the results

    All subnet details — network address, broadcast, host range, masks, and class — are calculated and displayed instantly.

  4. 4

    Adjust as needed

    Change the IP or prefix at any time. Results update automatically as you type.

Frequently asked questions

What is CIDR notation?
CIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length, such as 192.168.1.0/24. The prefix length indicates how many bits of the address identify the network, with the remaining bits identifying hosts.
What is a wildcard mask?
A wildcard mask is the bitwise inverse of the subnet mask. It is commonly used in access control lists (ACLs) on network equipment to match ranges of IP addresses.
What is the difference between total hosts and usable hosts?
Total hosts is 2 raised to the power of host bits. Usable hosts subtracts two — one for the network address and one for the broadcast address — except for /31 and /32 subnets which have special handling.
Does this tool support IPv6?
This version calculates IPv4 subnets only. IPv6 subnet calculation may be added in a future update.

Enter an IP address and CIDR prefix length to instantly calculate

every detail of the subnet: network address, broadcast address, first

and last usable hosts, total and usable host counts, subnet mask,

wildcard mask, IP class, and binary mask representation. Common prefix

presets make it easy to switch between popular subnet sizes. All

calculations are pure client-side maths — no data leaves your browser.

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