CIDR Calculator Online
Calculate IPv4 subnet details from CIDR notation. Use it for testing, debugging, prototyping, demos, and day-to-day developer workflows without installing anything.
๐ CIDR Calculator Online
Calculate IPv4 subnet details from CIDR notation. Free online developer tool for fast browser-based work.
Input IP
192.168.1.0 /24Network address
192.168.1.0Broadcast address
192.168.1.255First usable host
192.168.1.1Last usable host
192.168.1.254Usable hosts
254Total addresses
256Subnet mask
255.255.255.0Wildcard mask
0.0.0.255What it's for
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Testing and QA
Calculate IPv4 subnet details from CIDR notation
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Seed data
Useful for demos, fixtures, and browser-based checks
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Developer workflows
Supports front-end, back-end, product, and DevOps tasks
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Fast and local
Runs directly in the browser with instant copy-and-paste output