# IP Address Ownership Lookup (RDAP)

> IP Address Ownership Lookup (RDAP) is a paid API for AI agents from twin.unykorn.org, paid per call via x402, $0.002/call, status unknown (last checked 2026-10-01).

Returns RDAP-based ownership details for an IPv4 or IPv6 address, including network name, organization, country, and CIDR block.

## Facts

- Endpoint: POST https://twin.unykorn.org/web/ip-whois?utm_source=zero.xyz
- Price: $0.002/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-01
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/ip-address-ownership-lookup-rdap-54c2cd41
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_lqqNInfPVAwt7kXyfqSqc

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 ip-address-ownership-lookup-rdap-54c2cd41 -d '<json body>'
```

Example prompt: Who owns the IP address 203.0.113.45 — can you look up the network name, organization, country, and CIDR block via RDAP?

## When to prefer this

Use this endpoint when you need authoritative RDAP-based ownership data for an IP address — specifically network name, organization, country, and CIDR block. Prefer this over simple geolocation APIs when you need the registered owner/operator rather than approximate physical location, or when you need the canonical network assignment block (CIDR) for security, compliance, or network analysis workflows.

## Known failure modes

- Invalid or malformed IP address returns an error
- Private/reserved IP ranges (e.g. 192.168.x.x, 10.x.x.x) may return no RDAP record
- RDAP registry may have incomplete or missing records for some IP blocks
- Rate limiting or payment failure may prevent query execution
- IPv6 addresses in non-standard notation may fail to parse

## How this service works

IP address ownership (RDAP): network, organization, country, CIDR — Genesis402 / UnyKorn Operator Network

## Output

Returns structured RDAP data for the queried IP including: network/block name, registrant organization name, country code, and CIDR notation of the assigned IP range.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "params": {
   "type": "object",
   "properties": {
    "ip": {
     "type": "string",
     "description": "required IPv4 or IPv6"
    }
   }
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "ok": true,
  "type": "whois-ip",
  "receipt": {
   "tx_hash": "0x<64hex>",
   "amount_usd": 0.002,
   "receipt_id": "g402-<16hex>"
  },
  "sources": [
   {
    "ok": true,
    "name": "<source>"
   }
  ],
  "limitations": "<text>",
  "generated_at": "<iso time>",
  "evidence_hash": "sha256:<64hex>"
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/ip-address-ownership-lookup-rdap-54c2cd41/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from twin.unykorn.org](https://www.zero.xyz/host/twin.unykorn.org/llms.txt)