# ipv4.fr WHOIS Lookup API

> ipv4.fr WHOIS Lookup API is a paid API for AI agents from ipv4.fr, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-29).

Retrieves WHOIS registration data for a given domain, including registrar, creation date, and ownership details

## Facts

- Endpoint: GET https://ipv4.fr/x402/v1/whois/%7Bdomain%7D?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-29
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ipv4-fr-whois-lookup-api-c91d0043
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZqkBxlaykSVR2jZFsKNe-

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability ipv4-fr-whois-lookup-api-c91d0043
```

Example prompt: Can you pull up the WHOIS record for example.com and tell me who registered it, when it was created, and which registrar is managing it?

## When to prefer this

Choose this endpoint when you need quick, parsed WHOIS registration data for a domain without setting up a full WHOIS client. It is ideal for agents performing domain due diligence, cybersecurity investigations, or domain age verification, and is priced per call at $0.003 USDC making it cost-effective for occasional lookups. Prefer this over raw WHOIS socket queries when you need structured, JSON-parsed output rather than raw text.

## Known failure modes

- Domain not found or unregistered — returns empty or error response
- TLD not supported by WHOIS lookup — may return incomplete data
- WHOIS rate limiting by upstream registry — may result in timeout or empty response
- Malformed domain input — invalid domain format causes request failure
- Private/redacted WHOIS — registrant info may be masked by privacy services

## How this service works

Fast, reliable network tools API. IP geolocation, DNS lookup, SSL check, WHOIS, email validation, port scan. Free tier available.

## Output

A JSON object containing the queried domain name and a parsed WHOIS record with fields such as registrar name, creation date, expiration date, updated date, registrant contact details, and nameservers — all derived from public WHOIS registry data.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "properties": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "domain": "example.com",
  "parsed": {
   "registrar": "Example Registrar",
   "creation_date": "1995-08-14T04:00:00Z"
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ipv4-fr-whois-lookup-api-c91d0043/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from ipv4.fr](https://www.zero.xyz/host/ipv4.fr/llms.txt)