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Whois lookup | 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": "whois-lookup",
  "category": "network-tools",
  "built": true,
  "requirements": "RDAP-first registration lookup with redaction and registry-specific availability.",
  "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": "Domain name",
      "placeholder": "happytails.ai",
      "help": "Enter one domain name without https://, a path or a port.",
      "action": "Check domain"
    },
    "mode": "explicit",
    "interactive": false
  },
  "execution": "POST /api/v1/tools/whois-lookup/run",
  "api": {
    "id": "whois-lookup",
    "name": "Whois lookup",
    "category": "network-tools",
    "description": "RDAP-first registration lookup with redaction and registry-specific availability.",
    "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/whois-lookup/",
    "method": "POST",
    "endpoint": "/api/v1/tools/whois-lookup/run",
    "schema_url": "/api/v1/tools/whois-lookup",
    "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"
  }
}

Page guide

RDAP-first registration lookup with redaction and registry-specific availability..

Useful next steps

How to use Whois lookup

  1. Enter a domain name in the input field.
  2. Review the settings, then choose Check domain.
  3. Review the result, then use Copy result or a download link when available.

Working with whois lookup

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: What is my IP, IP lookup, DNS lookup.