# IP range to CIDR

- Human page: https://happytails.ai/en/network-tools/ip-range-to-cidr/
- Markdown: https://happytails.ai/en/network-tools/ip-range-to-cidr.md
- Structured JSON: https://happytails.ai/agents/en/network-tools/ip-range-to-cidr/index.json
- Visibility: public

## Tool capabilities

| Property | Value |
| --- | --- |
| Tool ID | `ip-range-to-cidr` |
| Category | network-tools |
| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |
| Browser execution | Automatic updates after valid input or file selection. |
| Browser processing | Browser; see tool notes for network behavior. |
| HTTP API | /api/v1/tools/ip-range-to-cidr/run |
| Browser-agent interface | run_current_tool |

### Inputs and settings

Text input: Starting IP address.

Example or placeholder shown in the interface (not a validated fixture):

```text
192.168.1.0
```

Enter the first address here and the last address in Ending IP address below. Results update as you type. Up to 1,000,000 characters.

| Setting | Meaning | Control type | Default | Constraints |
| --- | --- | --- | --- | --- |
| `end` | Ending IP address | text | "192.168.1.255" |  |

### HTTP contract

API 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.

```http
POST https://happytails.ai/api/v1/tools/ip-range-to-cidr/run
Content-Type: application/json
```

[Detailed operation reference](https://happytails.ai/en/api/tools/ip-range-to-cidr.md) · [Shared API guide](https://happytails.ai/en/api.md)

#### Limits

| Limit | Value |
| --- | --- |
| request_bytes | 8388608 |
| input_characters | 1000000 |
| files_bytes | 5242880 |
| max_files | 0 |
| timeout_seconds | 12 |

#### Complete input schema

```json
{
  "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": {
        "end": {
          "type": "string",
          "description": "Ending IP address",
          "default": "192.168.1.255"
        }
      }
    }
  }
}
```

#### Complete output schema

```json
{
  "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"
              }
            }
          }
        }
      }
    }
  }
}
```

#### Error and retry handling

Failures 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.

### Browser-agent workflow

1. Open the human page in a browser that supports WebMCP.
2. Discover the interface exposed by that page; use its actual schema.
3. Select files on the page first when the tool requires files.
4. Call `run_current_tool` with valid input and settings.
5. Inspect the returned result or error and the displayed output. Retrieve files from the displayed download links.

Calls do not automatically copy or download results. Browser permissions still apply. Interface availability alone is not proof of successful execution.

### Planning specification

Minimal exact covering blocks; validate ordering and address family.

This describes intended requirements. Use the implementation notes, interface schema and observed output to determine current support.

### Complete machine-readable capability record

```json
{
  "id": "ip-range-to-cidr",
  "category": "network-tools",
  "built": true,
  "requirements": "Minimal exact covering blocks; validate ordering and address family.",
  "implementation": {
    "fields": [
      {
        "key": "end",
        "label": "Ending IP address",
        "value": "192.168.1.255",
        "type": "text"
      }
    ],
    "experience": {
      "automatic": true,
      "single": true,
      "label": "Starting IP address",
      "placeholder": "192.168.1.0",
      "help": "Enter the first address here and the last address in Ending IP address below. Results update as you type. Up to 1,000,000 characters.",
      "action": null
    },
    "mode": "automatic",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/ip-range-to-cidr/run",
  "api": {
    "id": "ip-range-to-cidr",
    "name": "IP range to CIDR",
    "category": "network-tools",
    "description": "Minimal exact covering blocks.",
    "notes": "",
    "human_path": "/en/network-tools/ip-range-to-cidr/",
    "method": "POST",
    "endpoint": "/api/v1/tools/ip-range-to-cidr/run",
    "schema_url": "/api/v1/tools/ip-range-to-cidr",
    "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": {
            "end": {
              "type": "string",
              "description": "Ending IP address",
              "default": "192.168.1.255"
            }
          }
        }
      }
    },
    "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

Minimal exact covering blocks.

## Useful next steps

- [Subnet calculator](https://happytails.ai/en/network-tools/subnet-calculator/): IPv4/IPv6 ranges, prefix length and usable-address conventions. ([Markdown](https://happytails.ai/en/network-tools/subnet-calculator.md))

- [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))

- [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))

## How to use IP range to CIDR

1. Enter starting ip address 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 ip range to cidr

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: [Subnet calculator](https://happytails.ai/en/network-tools/subnet-calculator/), [CIDR to range](https://happytails.ai/en/network-tools/cidr-to-range/), [Ipv6 compress](https://happytails.ai/en/network-tools/ipv6-compress/).