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Subnet calculator | agent view

The same page content and links, with explicit tool capabilities. Tools marked with an API can run directly through HTTP. Other tools require the browser interface or are not connected yet.

Tool capabilities

{
  "id": "subnet-calculator",
  "category": "network-tools",
  "built": true,
  "requirements": "IPv4/IPv6 ranges, prefix length and usable-address conventions; exact integer arithmetic.",
  "implementation": {
    "fields": [],
    "experience": {
      "automatic": true,
      "single": true,
      "label": "Network in CIDR notation",
      "placeholder": "192.0.2.0/24",
      "help": "Enter an IP address followed by a slash and prefix length. Results update as you type. Up to 1,000,000 characters.",
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/subnet-calculator/run",
  "api": {
    "id": "subnet-calculator",
    "name": "Subnet calculator",
    "category": "network-tools",
    "description": "IPv4/IPv6 ranges, prefix length and usable-address conventions.",
    "notes": "",
    "human_path": "/en/network-tools/subnet-calculator/",
    "method": "POST",
    "endpoint": "/api/v1/tools/subnet-calculator/run",
    "schema_url": "/api/v1/tools/subnet-calculator",
    "input_schema": {
      "type": "object",
      "additionalProperties": false,
      "properties": {
        "input": {
          "type": "string",
          "maxLength": 1000000,
          "default": "",
          "description": "Plain text input. File tools use files instead unless otherwise documented."
        },
        "options": {
          "type": "object",
          "additionalProperties": false,
          "properties": {}
        }
      }
    },
    "output_schema": {
      "type": "object",
      "required": [
        "tool",
        "result"
      ],
      "properties": {
        "tool": {
          "type": "string"
        },
        "result": {
          "type": "object",
          "required": [
            "text",
            "files"
          ],
          "properties": {
            "text": {
              "type": [
                "string",
                "null"
              ]
            },
            "data": {
              "description": "Parsed JSON when the textual result is JSON."
            },
            "name": {
              "type": "string"
            },
            "mime": {
              "type": "string"
            },
            "files": {
              "type": "array",
              "items": {
                "type": "object",
                "required": [
                  "name",
                  "mime",
                  "bytes",
                  "base64"
                ],
                "properties": {
                  "name": {
                    "type": "string"
                  },
                  "mime": {
                    "type": "string"
                  },
                  "bytes": {
                    "type": "integer"
                  },
                  "base64": {
                    "type": "string",
                    "contentEncoding": "base64"
                  }
                }
              }
            }
          }
        }
      }
    },
    "processing": "Server; same transformation code as browser tools",
    "limits": {
      "request_bytes": 8388608,
      "input_characters": 1000000,
      "files_bytes": 5242880,
      "max_files": 0,
      "timeout_seconds": 12
    }
  },
  "agent_processing": "Server; same transformation code as browser tools",
  "browser_agent": {
    "supported": true,
    "name": "run_current_tool",
    "discovery": "WebMCP on the human page in a supporting browser",
    "verification": "See audit/API-AUDIT.md; availability is not verification"
  }
}

Page guide

IPv4/IPv6 ranges, prefix length and usable-address conventions.

Useful next steps

How to use Subnet calculator

  1. Enter network in cidr notation in the input field.
  2. The result updates as you type. Adjust the available settings if needed.
  3. Review the result, then use Copy result or a download link when available.

Working with subnet calculator

A network lookup is a snapshot from a particular resolver, location and time. DNS answers, routing paths and certificates can change, so a result is most useful when the query and observation time are clear.

Common questions

Why do DNS results differ between locations?

Resolvers can cache records for different periods, and some services deliberately return location-specific answers. A mismatch does not on its own identify a configuration fault.

Can browser code perform every network check?

Browsers restrict arbitrary network access. Some diagnostics need a server or a public service; that service’s observation point affects what the result means.

Continue your workflow: CIDR to range, IP range to CIDR, Ipv6 compress.