cidrcalculator.net valid
cidrcalculator.net
Free, browser-based CIDR / subnet calculator and network planning toolkit. IPv4 and IPv6 support, multi-cloud awareness (AWS, Azure, GCP, OCI), VLSM design, overlap detection, IaC export for Terraform / CloudFormation / Pulumi / CDK / Ansible / Bicep, IPAM-Lite, RFC validation, an AI-powered subnet design assistant, and 109 learning lessons. All computation happens client-side — no data leaves the browser.
- Authority
- 45 reach 0 · trust 5 · quality 25 · freshness 15
- Tier
- listed
- llms.txt
- https://cidrcalculator.net/llms.txt
- llms-full.txt
- https://cidrcalculator.net/llms-full.txt
- Sections
- 7
- Links
- 36
- Size
- 8853 bytes
- Country
- France Hosting inference
- Hosting country
- France Hosting inference
- Country evidence
- No published address evidence collected yet
- For agents
- Documentation: developer or product docs worth reading, nothing to call
- First seen
- 2026-10-25T23:11:51.840Z
- Last checked
- 2026-10-25T23:11:52.925Z
- Badge
Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-25T23:11:51.914Z. Cached copy · Source on cidrcalculator.net
# cidrcalculator.net
> Free, browser-based CIDR / subnet calculator and network planning toolkit. IPv4 and IPv6 support, multi-cloud awareness (AWS, Azure, GCP, OCI), VLSM design, overlap detection, IaC export for Terraform / CloudFormation / Pulumi / CDK / Ansible / Bicep, IPAM-Lite, RFC validation, an AI-powered subnet design assistant, and 109 learning lessons. All computation happens client-side — no data leaves the browser.
This site is designed for network engineers, cloud architects, DevOps practitioners, students preparing for CCNA / Network+, and anyone who needs to plan, validate, or document IP address allocations.
## Core Tools
- [CIDR Calculator](https://cidrcalculator.net/calculator.html): IPv4 and IPv6 calculator with network address, broadcast, mask, wildcard, host range, binary representation, overlap detection, supernet aggregation, and range-to-CIDR conversion.
- [VLSM Planner](https://cidrcalculator.net/vlsm.html): Variable-length subnet allocation from a parent CIDR block. Input host counts, get optimally sized subnets allocated in order.
- [Cloud-Aware Calculator](https://cidrcalculator.net/cloud.html): Subnet calculator that accounts for cloud-provider reserved IPs. AWS reserves 5 per subnet, Azure 5, GCP 4, Oracle Cloud (OCI) 3. Minimum subnet sizes also handled per provider.
- [IaC Export](https://cidrcalculator.net/iac-export.html): Convert subnet plans to deployable infrastructure code. Supports Terraform, AWS CloudFormation, Pulumi, AWS CDK, Ansible, and Azure Bicep.
- [AI Subnet Assistant](https://cidrcalculator.net/ai-assistant.html): Describe a network in plain English and get a complete CIDR design with reasoning. 100-pattern rule engine, runs entirely client-side.
- [Network Visualizer](https://cidrcalculator.net/visualize.html): Five visualization modes — tree, VPC topology, bitmap, heatmap, and Mermaid diagram.
- [CIDR Validator](https://cidrcalculator.net/validate.html): RFC compliance checks. Catches host bits set, reserved ranges, loopback, link-local, multicast, CGNAT, TEST-NET, and edge cases like /31 and /32. Supports bulk validation.
- [IPAM-Lite](https://cidrcalculator.net/ipam.html): Browser-local IP address management for small teams. Inventory tracking, conflict detection, CSV export.
- [Workspace](https://cidrcalculator.net/workspace.html): Saved network projects with shareable URLs for collaboration.
## Learning Resources
- [Learn Center](https://cidrcalculator.net/learn.html): 109 micro-lessons on subnetting, CIDR, VLSM, IPv6, BGP, cloud networking, and Kubernetes networking. Quizzes for knowledge checks.
- [Documentation](https://cidrcalculator.net/docs.html): Comprehensive site documentation including tool guides and CIDR reference.
- [Blog Index](https://cidrcalculator.net/blog.html): 24 in-depth articles on networking and cloud subnet design.
## Blog Articles
- [How to Calculate Subnets](https://cidrcalculator.net/blog/how-to-calculate-subnets.html): Step-by-step binary math for subnett
…Machine-readable: GET /v1/resolve?q=cidrcalculator.net · GET /v1/domain/cidrcalculator.net · this page as Accept: application/json or text/markdown · MCP lookup_domain
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