{
  "title": "Reverse DNS",
  "human_url": "https://happytails.ai/en/network-tools/reverse-dns/",
  "agent_url": "https://happytails.ai/agents/en/network-tools/reverse-dns/",
  "language": "en",
  "markdown_url": "https://happytails.ai/en/network-tools/reverse-dns.md",
  "content": "Reverse DNS\nPTR query results and missing-record states.\nUseful next steps\nWhat is my IP\nDisplay public IPv4/IPv6 observed by endpoint.\nIP lookup\nASN, approximate geography and data timestamp.\nDNS lookup\nA AAAA MX TXT CNAME NS SOA records with resolver and time.\nHow to use Reverse DNS\nEnter an IP address in the input field.\nReview the settings, then choose Run Reverse DNS.\nReview the result, then use Copy result or a download link when available.\nWorking with reverse dns\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:\nWhat is my IP\n,\nIP lookup\n,\nDNS lookup\n.",
  "content_format": "text/plain",
  "visibility": "public",
  "links": [
    {
      "name": "What is my IP Display public IPv4/IPv6 observed by endpoint.",
      "url": "https://happytails.ai/en/network-tools/what-is-my-ip/"
    },
    {
      "name": "IP lookup ASN, approximate geography and data timestamp.",
      "url": "https://happytails.ai/en/network-tools/ip-lookup/"
    },
    {
      "name": "DNS lookup A AAAA MX TXT CNAME NS SOA records with resolver and time.",
      "url": "https://happytails.ai/en/network-tools/dns-lookup/"
    }
  ],
  "tool": {
    "id": "reverse-dns",
    "category": "network-tools",
    "built": true,
    "requirements": "PTR query results and missing-record states; do not infer ownership.",
    "implementation": {
      "fields": [],
      "processing": "Server required",
      "note": "Uses the local diagnostic server to contact the supplied public host or DNS/RDAP provider. Only public internet addresses are permitted; requests time out and redirects are bounded.",
      "experience": {
        "automatic": false,
        "single": true,
        "label": "IP address",
        "placeholder": "8.8.8.8",
        "help": "Up to 1,000,000 characters. Review the settings before running.",
        "action": null
      },
      "mode": "explicit",
      "interactive": false
    },
    "execution": "POST /api/v1/tools/reverse-dns/run",
    "api": {
      "id": "reverse-dns",
      "name": "Reverse DNS",
      "category": "network-tools",
      "description": "PTR query results and missing-record states.",
      "notes": "Uses the local diagnostic server to contact the supplied public host or DNS/RDAP provider. Only public internet addresses are permitted; requests time out and redirects are bounded.",
      "human_path": "/en/network-tools/reverse-dns/",
      "method": "POST",
      "endpoint": "/api/v1/tools/reverse-dns/run",
      "schema_url": "/api/v1/tools/reverse-dns",
      "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; contacts public network services",
      "limits": {
        "request_bytes": 8388608,
        "input_characters": 1000000,
        "files_bytes": 5242880,
        "max_files": 0,
        "timeout_seconds": null
      }
    },
    "agent_processing": "Server; contacts public network services",
    "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": "# Reverse DNS\n\n- Human page: https://happytails.ai/en/network-tools/reverse-dns/\n- Markdown: https://happytails.ai/en/network-tools/reverse-dns.md\n- Structured JSON: https://happytails.ai/agents/en/network-tools/reverse-dns/index.json\n- Visibility: public\n\n## Tool capabilities\n\n| Property | Value |\n| --- | --- |\n| Tool ID | `reverse-dns` |\n| Category | network-tools |\n| Implementation | Registered implementation. Registration alone is not a production-quality guarantee. |\n| Browser execution | Use the visible action or interactive controls. |\n| Browser processing | Server required |\n| HTTP API | /api/v1/tools/reverse-dns/run |\n| Browser-agent interface | run_current_tool |\n\n### Implementation notes\n\nUses the local diagnostic server to contact the supplied public host or DNS/RDAP provider. Only public internet addresses are permitted; requests time out and redirects are bounded.\n\n### Inputs and settings\n\nText input: IP address.\n\nExample or placeholder shown in the interface (not a validated fixture):\n\n```text\n8.8.8.8\n```\n\nUp to 1,000,000 characters. Review the settings before running.\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/reverse-dns/run\nContent-Type: application/json\n```\n\n[Detailed operation reference](https://happytails.ai/en/api/tools/reverse-dns.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 | Operation-specific network bounds |\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\nPTR query results and missing-record states; do not infer ownership.\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\": \"reverse-dns\",\n  \"category\": \"network-tools\",\n  \"built\": true,\n  \"requirements\": \"PTR query results and missing-record states; do not infer ownership.\",\n  \"implementation\": {\n    \"fields\": [],\n    \"processing\": \"Server required\",\n    \"note\": \"Uses the local diagnostic server to contact the supplied public host or DNS/RDAP provider. Only public internet addresses are permitted; requests time out and redirects are bounded.\",\n    \"experience\": {\n      \"automatic\": false,\n      \"single\": true,\n      \"label\": \"IP address\",\n      \"placeholder\": \"8.8.8.8\",\n      \"help\": \"Up to 1,000,000 characters. Review the settings before running.\",\n      \"action\": null\n    },\n    \"mode\": \"explicit\",\n    \"interactive\": false\n  },\n  \"execution\": \"POST /api/v1/tools/reverse-dns/run\",\n  \"api\": {\n    \"id\": \"reverse-dns\",\n    \"name\": \"Reverse DNS\",\n    \"category\": \"network-tools\",\n    \"description\": \"PTR query results and missing-record states.\",\n    \"notes\": \"Uses the local diagnostic server to contact the supplied public host or DNS/RDAP provider. Only public internet addresses are permitted; requests time out and redirects are bounded.\",\n    \"human_path\": \"/en/network-tools/reverse-dns/\",\n    \"method\": \"POST\",\n    \"endpoint\": \"/api/v1/tools/reverse-dns/run\",\n    \"schema_url\": \"/api/v1/tools/reverse-dns\",\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; contacts public network services\",\n    \"limits\": {\n      \"request_bytes\": 8388608,\n      \"input_characters\": 1000000,\n      \"files_bytes\": 5242880,\n      \"max_files\": 0,\n      \"timeout_seconds\": null\n    }\n  },\n  \"agent_processing\": \"Server; contacts public network services\",\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\nPTR query results and missing-record states.\n\n## Useful next steps\n\n- [What is my IP](https://happytails.ai/en/network-tools/what-is-my-ip/): Display public IPv4/IPv6 observed by endpoint. ([Markdown](https://happytails.ai/en/network-tools/what-is-my-ip.md))\n\n- [IP lookup](https://happytails.ai/en/network-tools/ip-lookup/): ASN, approximate geography and data timestamp. ([Markdown](https://happytails.ai/en/network-tools/ip-lookup.md))\n\n- [DNS lookup](https://happytails.ai/en/network-tools/dns-lookup/): A AAAA MX TXT CNAME NS SOA records with resolver and time. ([Markdown](https://happytails.ai/en/network-tools/dns-lookup.md))\n\n## How to use Reverse DNS\n\n1. Enter an IP address in the input field.\n2. Review the settings, then choose Run Reverse DNS.\n3. Review the result, then use Copy result or a download link when available.\n\n## Working with reverse dns\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: [What is my IP](https://happytails.ai/en/network-tools/what-is-my-ip/), [IP lookup](https://happytails.ai/en/network-tools/ip-lookup/), [DNS lookup](https://happytails.ai/en/network-tools/dns-lookup/).\n"
}