IPv4, IPv6 & CIDR Subnet Calculator

Calculates the network address, broadcast, mask, wildcard, usable range, and address count of an IPv4 subnet or an IPv6 prefix (using BigInt, with no precision limits, and with no broadcast concept in IPv6), divides a subnet into smaller subnets with strict limits, checks whether an address belongs to a network, and compares two networks. It never performs geolocation or looks up an address's owner, ISP, ASN, or reputation.

Processed on your device, no AIhasta 4.096 subredes por división

Data is processed on your device and never sent to the server. No geolocation or owner/ISP/ASN lookup is performed.

IPv4 address

CIDR prefix (/0-32)

Or mask (optional, replaces the prefix)

The content is processed on your device and is never uploaded to the server.

Use cases

Calculate an IPv4 subnet's network and broadcast address
Divide a /24 network into smaller /26 subnets
Check whether an IP belongs to a specific subnet

How to use this tool

Enter the IP address and the prefix or mask
Choose information, division, membership, or comparison
Check the results table and download it

Frequently asked questions

Does it tell me an IP's owner or location?

No. This tool only does local network arithmetic; it never looks up geolocation, owner, ISP, ASN, or reputation for any address.

Does IPv6 have a broadcast address like IPv4?

No. IPv6 has no broadcast concept; this tool never shows a broadcast field for IPv6, unlike IPv4.

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