By Team Hypomnema · Web & network
Calculate network boundaries, address counts and child subnets.
Use the guide alongside the working tool.
Open IPv4 & IPv6 CIDR Calculator →Working local example
Use Try sample in the tool to load a labeled demonstration.Calculate network boundaries, address counts and child subnets.
Prepare the right input
Enter an IPv4 or IPv6 address with a prefix.
Choose an optional child prefix.
Review before using the result
Review canonical networks, ranges and subnet boundaries.
No network scanning or address assignment. Up to 256 child subnets. IPv4 /31 and /32 host counts follow point-to-point and single-address conventions.
Privacy and trust boundaries
Inputs remain in this browser. No online reputation, account, DNS or remote key lookup is performed. A static inspection is not a security certification.
Use the sample to learn the workflow. Clear sensitive input after use; private exports and clipboard contents require careful handling.
Ready to apply this workflow?
Try IPv4 & IPv6 CIDR Calculator →Explore a related workflow
- IP Allowlist Rule Tester: workflow, verification and limits
Simulate ordered allow and deny rules against supplied addresses.
- Security Headers Analyzer: workflow, verification and limits
Review pasted HTTP response headers and practical hardening gaps.
- CSP Builder & Analyzer: workflow, verification and limits
Build and inspect a Content Security Policy without contacting a site.
- Permissions Policy Builder: workflow, verification and limits
Create explicit browser-feature permission policies.
Keep your original files and review the result. Found unclear instructions? Contact Team Hypomnema.