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CIDR to IP Range Converter

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Network & IP

CIDR to IP Range Converter

Convert CIDR notation to IP range and vice versa.

Workspace

Run the tool here

Browser utility

Output

Run the workspace to see the response here.

How to use

Enter the CIDR block or dotted mask.
Convert and read the equivalent form.
Check the first and last addresses in the range.

About this tool

Convert between CIDR notation and an explicit subnet mask, and expand a CIDR block into its address range.

CIDR to IP Range Converter is part of the TmpMailer Network & IP set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Translating a cloud security-group rule.
Checking the size of an allocated block.
Converting documentation between formats.

Common questions

What does /24 mean?

The first 24 bits identify the network, leaving 8 bits for hosts — 256 addresses in total.

Can CIDR blocks overlap?

Yes. Overlapping ranges cause routing ambiguity, so audit allocations before merging networks.

Is 255.255.255.0 always /24?

For IPv4 yes. Non-contiguous masks are invalid in modern CIDR notation.

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