{
  "title": "Subnet calculator",
  "human_url": "https://happytails.ai/en/network-tools/subnet-calculator/",
  "agent_url": "https://happytails.ai/agents/en/network-tools/subnet-calculator/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/network-tools/subnet-calculator.md",
  "content": "Subnet calculator\nIPv4/IPv6 ranges, prefix length and usable-address conventions.\nUseful next steps\nCIDR to range\nFirst/last addresses, count and IPv6 support without allocating massive address lists.\nIP range to CIDR\nMinimal exact covering blocks.\nIpv6 compress\nCompress/expand canonical IPv6 with round-trip checks.\nHow to use Subnet calculator\nEnter network in cidr notation in the input field.\nThe result updates as you type. Adjust the available settings if needed.\nReview the result, then use Copy result or a download link when available.\nWorking with subnet calculator\nA 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.\nCommon questions\nWhy do DNS results differ between locations?\nResolvers 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.\nCan browser code perform every network check?\nBrowsers restrict arbitrary network access. Some diagnostics need a server or a public service; that service’s observation point affects what the result means.\nContinue your workflow:\nCIDR to range\n,\nIP range to CIDR\n,\nIpv6 compress\n.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "CIDR to range First/last addresses, count and IPv6 support without allocating massive address lists.",
      "url": "https://happytails.ai/en/network-tools/cidr-to-range/"
    },
    {
      "name": "IP range to CIDR Minimal exact covering blocks.",
      "url": "https://happytails.ai/en/network-tools/ip-range-to-cidr/"
    },
    {
      "name": "Ipv6 compress Compress/expand canonical IPv6 with round-trip checks.",
      "url": "https://happytails.ai/en/network-tools/ipv6-compress/"
    }
  ],
  "tool": {
    "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"
    }
  },
  "markdown": "# Subnet calculator\n\n- Human page: https://happytails.ai/en/network-tools/subnet-calculator/\n- Markdown: https://happytails.ai/en/network-tools/subnet-calculator.md\n- Structured JSON: https://happytails.ai/agents/en/network-tools/subnet-calculator/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `subnet-calculator` |\n| Category | network-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Automatic updates after valid input or file selection. |\n| Browser processing | Browser; see tool notes for network behavior. |\n| HTTP API | /api/v1/tools/subnet-calculator/run |\n| Browser-agent interface | run_current_tool |\n\n### Inputs and settings\n\nText input: Network in CIDR notation.\n\nExample or placeholder shown in the interface (not a validated fixture):\n\n```text\n192.0.2.0/24\n```\n\nEnter an IP address followed by a slash and prefix length. Results update as you type. Up to 1,000,000 characters.\n\nNo additional settings are declared for this tool.\n\n### HTTP contract\n\nAPI calls process supplied data on the server. The website origin is `https://happytails.ai`. Server API hosting is not connected on the public website yet. Use your local server origin to test these requests.\n\n```http\nPOST https://happytails.ai/api/v1/tools/subnet-calculator/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/subnet-calculator.md) · [Shared API guide](https://happytails.ai/en/api.md)\n\n#### Limits\n\n| Limit | Value |\n| --- | --- |\n| request_bytes | 8388608 |\n| input_characters | 1000000 |\n| files_bytes | 5242880 |\n| max_files | 0 |\n| timeout_seconds | 12 |\n\n#### Complete input schema\n\n```json\n{\n  \"type\": \"object\",\n  \"additionalProperties\": false,\n  \"properties\": {\n    \"input\": {\n      \"type\": \"string\",\n      \"maxLength\": 1000000,\n      \"default\": \"\",\n      \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n    },\n    \"options\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {}\n    }\n  }\n}\n```\n\n#### Complete output schema\n\n```json\n{\n  \"type\": \"object\",\n  \"required\": [\n    \"tool\",\n    \"result\"\n  ],\n  \"properties\": {\n    \"tool\": {\n      \"type\": \"string\"\n    },\n    \"result\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"text\",\n        \"files\"\n      ],\n      \"properties\": {\n        \"text\": {\n          \"type\": [\n            \"string\",\n            \"null\"\n          ]\n        },\n        \"data\": {\n          \"description\": \"Parsed JSON when the textual result is JSON.\"\n        },\n        \"name\": {\n          \"type\": \"string\"\n        },\n        \"mime\": {\n          \"type\": \"string\"\n        },\n        \"files\": {\n          \"type\": \"array\",\n          \"items\": {\n            \"type\": \"object\",\n            \"required\": [\n              \"name\",\n              \"mime\",\n              \"bytes\",\n              \"base64\"\n            ],\n            \"properties\": {\n              \"name\": {\n                \"type\": \"string\"\n              },\n              \"mime\": {\n                \"type\": \"string\"\n              },\n              \"bytes\": {\n                \"type\": \"integer\"\n              },\n              \"base64\": {\n                \"type\": \"string\",\n                \"contentEncoding\": \"base64\"\n              }\n            }\n          }\n        }\n      }\n    }\n  }\n}\n```\n\n#### Error and retry handling\n\nFailures return a non-200 status and `error.code` plus `error.message`. Correct invalid input before retrying; retry server-busy responses with bounded backoff. Returned files contain Base64 data, not persistent download URLs. Decode and inspect the output before treating conversion as successful. See the shared API guide for the complete status and timeout rules.\n\n### Browser-agent workflow\n\n1. Open the human page in a browser that supports WebMCP.\n2. Discover the interface exposed by that page; use its actual schema.\n3. Select files on the page first when the tool requires files.\n4. Call `run_current_tool` with valid input and settings.\n5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.\n\nCalls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.\n\n### Planning specification\n\nIPv4/IPv6 ranges, prefix length and usable-address conventions; exact integer arithmetic.\n\nThis describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.\n\n### Complete machine-readable capability record\n\n```json\n{\n  \"id\": \"subnet-calculator\",\n  \"category\": \"network-tools\",\n  \"built\": true,\n  \"requirements\": \"IPv4/IPv6 ranges, prefix length and usable-address conventions; exact integer arithmetic.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"experience\": {\n      \"automatic\": true,\n      \"single\": true,\n      \"label\": \"Network in CIDR notation\",\n      \"placeholder\": \"192.0.2.0/24\",\n      \"help\": \"Enter an IP address followed by a slash and prefix length. Results update as you type. Up to 1,000,000 characters.\",\n      \"action\": null\n    },\n    \"mode\": \"automatic\",\n    \"interactive\": false\n  },\n  \"execution\": \"POST /api/v1/tools/subnet-calculator/run\",\n  \"api\": {\n    \"id\": \"subnet-calculator\",\n    \"name\": \"Subnet calculator\",\n    \"category\": \"network-tools\",\n    \"description\": \"IPv4/IPv6 ranges, prefix length and usable-address conventions.\",\n    \"notes\": \"\",\n    \"human_path\": \"/en/network-tools/subnet-calculator/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/subnet-calculator/run\",\n    \"schema_url\": \"/api/v1/tools/subnet-calculator\",\n    \"input_schema\": {\n      \"type\": \"object\",\n      \"additionalProperties\": false,\n      \"properties\": {\n        \"input\": {\n          \"type\": \"string\",\n          \"maxLength\": 1000000,\n          \"default\": \"\",\n          \"description\": \"Plain text input. File tools use files instead unless otherwise documented.\"\n        },\n        \"options\": {\n          \"type\": \"object\",\n          \"additionalProperties\": false,\n          \"properties\": {}\n        }\n      }\n    },\n    \"output_schema\": {\n      \"type\": \"object\",\n      \"required\": [\n        \"tool\",\n        \"result\"\n      ],\n      \"properties\": {\n        \"tool\": {\n          \"type\": \"string\"\n        },\n        \"result\": {\n          \"type\": \"object\",\n          \"required\": [\n            \"text\",\n            \"files\"\n          ],\n          \"properties\": {\n            \"text\": {\n              \"type\": [\n                \"string\",\n                \"null\"\n              ]\n            },\n            \"data\": {\n              \"description\": \"Parsed JSON when the textual result is JSON.\"\n            },\n            \"name\": {\n              \"type\": \"string\"\n            },\n            \"mime\": {\n              \"type\": \"string\"\n            },\n            \"files\": {\n              \"type\": \"array\",\n              \"items\": {\n                \"type\": \"object\",\n                \"required\": [\n                  \"name\",\n                  \"mime\",\n                  \"bytes\",\n                  \"base64\"\n                ],\n                \"properties\": {\n                  \"name\": {\n                    \"type\": \"string\"\n                  },\n                  \"mime\": {\n                    \"type\": \"string\"\n                  },\n                  \"bytes\": {\n                    \"type\": \"integer\"\n                  },\n                  \"base64\": {\n                    \"type\": \"string\",\n                    \"contentEncoding\": \"base64\"\n                  }\n                }\n              }\n            }\n          }\n        }\n      }\n    },\n    \"processing\": \"Server; same transformation code as browser tools\",\n    \"limits\": {\n      \"request_bytes\": 8388608,\n      \"input_characters\": 1000000,\n      \"files_bytes\": 5242880,\n      \"max_files\": 0,\n      \"timeout_seconds\": 12\n    }\n  },\n  \"agent_processing\": \"Server; same transformation code as browser tools\",\n  \"browser_agent\": {\n    \"supported\": true,\n    \"name\": \"run_current_tool\",\n    \"discovery\": \"WebMCP on the human page in a supporting browser\",\n    \"verification\": \"See audit/API-AUDIT.md; availability is not verification\"\n  }\n}\n```\n\n## Page guide\n\nIPv4/IPv6 ranges, prefix length and usable-address conventions.\n\n## Useful next steps\n\n- [CIDR to range](https://happytails.ai/en/network-tools/cidr-to-range/): First/last addresses, count and IPv6 support without allocating massive address lists. ([Markdown](https://happytails.ai/en/network-tools/cidr-to-range.md))\n\n- [IP range to CIDR](https://happytails.ai/en/network-tools/ip-range-to-cidr/): Minimal exact covering blocks. ([Markdown](https://happytails.ai/en/network-tools/ip-range-to-cidr.md))\n\n- [Ipv6 compress](https://happytails.ai/en/network-tools/ipv6-compress/): Compress/expand canonical IPv6 with round-trip checks. ([Markdown](https://happytails.ai/en/network-tools/ipv6-compress.md))\n\n## How to use Subnet calculator\n\n1. Enter network in cidr notation in the input field.\n2. The result updates as you type. Adjust the available settings if needed.\n3. Review the result, then use Copy result or a download link when available.\n\n## Working with subnet calculator\n\nA 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.\n\n## Common questions\n\n### Why do DNS results differ between locations?\n\nResolvers 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.\n\n### Can browser code perform every network check?\n\nBrowsers restrict arbitrary network access. Some diagnostics need a server or a public service; that service’s observation point affects what the result means.\n\nContinue your workflow: [CIDR to range](https://happytails.ai/en/network-tools/cidr-to-range/), [IP range to CIDR](https://happytails.ai/en/network-tools/ip-range-to-cidr/), [Ipv6 compress](https://happytails.ai/en/network-tools/ipv6-compress/).\n"
}