Subnet Calculator
Subnet an IP range into networks
Source Input
Processed Output
What is the Subnet Calculator?
Network segmentation requires dividing address space into appropriately-sized subnets. Enter a parent block (e.g. 10.0.0.0/16) and the subnet prefix you need (e.g. /24) and this calculator enumerates every possible child subnet with its network address, range, and broadcast — the planning table for VLSM designs.
Frequently Asked Questions (FAQ)
Q: How many subnets fit in my block?
Each additional prefix bit doubles the count: a /16 split into /24s yields 256 subnets.
How to Use the Subnet Calculator
- 1Paste your input into the editor above — or start from the preloaded example.
- 2Adjust any options, then click Run to process instantly in your browser.
- 3Review the output panel, then copy, download, or save it as a reusable snippet.