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Terraform cidrsubnet Calculator
Calculate Terraform cidrsubnet results for IPv4 or IPv6 with exact BigInt prefix arithmetic.
This tool handles input and primary processing in your browser and is designed not to send the input to QuickKit’s server.
| Result CIDR | — |
|---|---|
| Terraform expression | — |
How it works
Implements Terraform's cidrsubnet(prefix, newbits, netnum) bit placement for IPv4 and IPv6. netnum must be non-negative and fit in newbits. Host bits in the input are normalized by CIDR parsing, and IPv4 octets with leading zeros are interpreted as decimal for Terraform compatibility. This evaluates only literal inputs; it does not run Terraform, evaluate expressions or variables, or validate provider and cloud subnet constraints.