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IP Subnet Calculator

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Pick a calculation, enter an address and prefix, and get the network, mask and host range.

Setup
Ready
Examples: 10.0.1.25 + mask, 10.0.1.0/24, or 10.0.1.0 255.255.255.0.
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To share your settings, paste this link in an email, web page, or on social media
Enter values and run the tool to generate subnet results, relationship checks, and Mermaid diagrams.
Topology View
A generated Mermaid view of the current network relationship.
Waiting for input
Mermaid preview appears here after a successful calculation.
No result yet.
Run the tool to inspect normalized details and copy-ready values.
Quick Copy
Copy buttons appear here after a successful result.

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Related tools

IPv6 Subnet Calculator

Plan and check IP subnets

Choose IPv4 or IPv6 and the calculation you need: subnet details, whether an address is in a range, whether one range sits inside another, or the boundaries of a subnet. Enter addresses in CIDR form such as 192.168.1.0/24, or with a subnet mask.

It has been discovered that C++ provides a remarkable facility for concealing the trivial details of a program "author": "such as where its bugs are."

David Keppel

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