IP Subnet Calculator
A tool for performing subnet calculations needed for network design and administration, instantly computing network address, broadcast address, usable host range, and host count from any IP address and subnet mask. It supports both CIDR notation (/24, /16) and dotted-decimal subnet mask input. Essential for network engineers designing subnet architectures, system administrators troubleshooting connectivity issues, and IT students learning IP addressing concepts.
How it works
- Uses AES-GCM 256-bit encryption
- Key derived from password using PBKDF2 (100,000 iterations)
- All processing is done in the browser (no data sent to server)
- The same password used for encryption is required for decryption
Practical Guide
Converters and validators for Base64, JWT, hashes, QR codes, URL encoding, and related formats. Helpful for API work, shareable data, and specification checks.
When this tool is useful
IP Subnet Calculator helps with common Encode & Convert tasks that require quick checking, conversion, or creation. It supports workflows such as Calculate network info from IP address and CIDR/subnet mask, Display network and broadcast addresses without forcing users to switch pages or apps.
Processing and privacy
Your input is processed in the browser and is not designed to be sent to a server just to use the tool. This makes it suitable for temporary checks, draft work, and pre-publication cleanup.
Workflow tip
After checking the result, use the related tools and same-category links near the bottom of the page to continue the surrounding task. Frequently used tools also appear in the Recently Used section.
IP Subnet Calculator Features
- Calculate network info from IP address and CIDR/subnet mask
- Display network and broadcast addresses
- Calculate usable host count and range
- Useful for network design and troubleshooting
How to Use
- 1Enter IP address and subnet mask (CIDR notation)
- 2Review network info (address, broadcast, host range)
- 3Copy needed information for use
FAQ
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