Tool detail

ASN Lookup

Returns the network operator, country, registry and address range behind a given IP address or ASN.

Categories: Domains IP

Use when

find who operates the network behind an IP address
look up ASN details like owner and country for AS15169

Not for

not IP geolocation for end-user location - network ownership only

Inputs

POST JSON body: { query: string } (required) - an IP address or an ASN reference such as AS15169 or 15169

Admitted input schema

{
  "type": "object",
  "properties": {
    "query": {
      "type": "string",
      "minLength": 0,
      "maxLength": 4096,
      "description": "An IP address (such as 8.8.8.8 or 2001:4860:4860::8888) or an ASN reference (such as AS15169 or 15169) to look up."
    }
  },
  "required": [
    "query"
  ],
  "additionalProperties": false
}

Endpoint

Method: POST
URL: https://asn-lookup.underscoredone.com/lookup

Payment

Protocol: x402
Listed price: 0.01 USDC per call on Base
Payment method: exact
Network: eip155:8453
Asset: 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913

Listed terms are catalog metadata. The caller supplies inputs and calls the tool outside Onelayer. If payment is required, the caller uses a compatible wallet to pay.

Source

Directory: Coinbase x402 Bazaar
Record: POST https://asn-lookup.underscoredone.com/lookup
Retrieved: 2026-09-30T20:37:07.382Z
Catalog file SHA-256: 6837ccddf886f0007cf3727ea9d27faaa5047b51b4f425345c554ce1c271a524
Catalog built: 2026-09-30T22:31:58.034Z