Network & IP Tool

IP Subnet Calculator

Calculate IPv4 CIDR ranges, subnet masks, usable host counts, network addresses and broadcast addresses.

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IPv4

Subnet input

Enter an IPv4 address and CIDR prefix. Example: 192.168.10.25 /24

IPv4 address CIDR prefix

Network address

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Broadcast address

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Subnet mask

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Wildcard mask

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First usable IP

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Last usable IP

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CIDR notation

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Total addresses

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Usable hosts

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Notes

Results update automatically while typing.

How to use this calculator

1. Enter IP

Add any IPv4 address inside the subnet.

2. Choose CIDR

Use a prefix from /0 to /32.

3. Read results

Review mask, range, broadcast and host capacity.

Learn more

CIDR — Wikipedia Subnetting — Wikipedia RFC 4632

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Tool Feedback

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Disclaimer: This calculator is provided for planning and educational purposes only. Results should be verified against operational requirements, local standards, vendor documentation and qualified engineering review before implementation in production environments.