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IP Subnet Calculator

Calculate IP address subnet info: network, broadcast, hosts, CIDR.

Local Processing
Files are not uploaded to any server. All operations are performed in your browser.
/816777214 hosts
/1665534 hosts
/24254 hosts
/25126 hosts
/2662 hosts
/2730 hosts
/2814 hosts
/296 hosts
/302 hosts

How to Use

  1. 1

    Enter IP address and subnet mask or CIDR notation.

  2. 2

    Click 'Calculate' to see subnet details.

  3. 3

    View network address, broadcast address, and host range.

  4. 4

    See the number of usable hosts in the subnet.

  5. 5

    Copy results for documentation or configuration.

Use Cases

Network Planning

Plan network segments and allocate IP ranges for servers and devices.

Network Debugging

Verify IP configurations and understand subnet boundaries.

Learning

Understand IP subnetting concepts with visual calculations.

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FAQ

What is CIDR notation?▾
CIDR (Classless Inter-Domain Routing) notation like /24 indicates the number of network bits in the subnet mask.
What are private IP addresses?▾
Private IPs are 10.x.x.x, 172.16-31.x.x, and 192.168.x.x. They are not routed on the public internet.