Index onlineMerchant portal
Api Endpoint

ASN Lookup

Given an internet address (IP) or a network identification number (ASN), this tool returns who operates that piece of the internet: the network number, the owner's name, the country it's registered in, the regional registry that manages it, and the exact address range it belongs to.

Open interactive test console

Offering

Provider
asn-lookup.underscoredone.com
Method
POST
Offering type
Api Endpoint
Transport type
http
Category
Infrastructure
Delivery
Not provided
Pricing model
Not provided
x402 version
2

Endpoint context

URL
https://asn-lookup.underscoredone.com/lookup
MIME type
application/json
First seen
2026-10-16T01:50:06.715Z
Last seen
Tags
asn lookup, IP lookup, asn, ip intelligence, who owns this ip

Website

Payment pricing

x402 payment terms are the authoritative price for calling this endpoint.

Payment option 1
0.01 USDC
Atomic price: 10000 · Network: eip155:8453 · Asset: USDC · Scheme: exact
Payment option 2
0.01 USDC
Atomic price: 10000 · Network: solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · Asset: USDC · Scheme: exact
Raw x402 terms
[
  {
    "scheme": "exact",
    "network": "eip155:8453",
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "amount": "10000",
    "payTo": "0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08"
  },
  {
    "scheme": "exact",
    "network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
    "asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
    "amount": "10000",
    "payTo": "8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b"
  }
]

Observed health

Status
Reachable
Latest latency
65 ms
Average latency
139 ms
HTTP status
405
Last checked
Reachability
100% over 7 checks

Latency is measured to the first response headers. A reachable result does not verify response accuracy or merchant identity.

Input schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string",
      "const": "http"
    },
    "method": {
      "type": "string",
      "enum": [
        "POST",
        "PUT",
        "PATCH"
      ]
    },
    "bodyType": {
      "type": "string",
      "enum": [
        "json",
        "form-data",
        "text"
      ]
    },
    "body": {
      "type": "object",
      "properties": {
        "query": {
          "type": "string",
          "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
    }
  },
  "required": [
    "type",
    "method",
    "bodyType",
    "body"
  ],
  "additionalProperties": false
}

Output schema

{
  "type": "object",
  "properties": {
    "type": {
      "type": "string"
    },
    "example": {
      "type": "object",
      "properties": {
        "api_version": {
          "type": "string"
        },
        "query": {
          "type": "string"
        },
        "asn": {
          "type": "string"
        },
        "holder": {
          "type": "string"
        },
        "country": {
          "type": "string"
        },
        "registry": {
          "type": "string"
        },
        "prefix": {
          "type": "string"
        },
        "allocated": {
          "type": "string"
        }
      },
      "required": [
        "api_version",
        "query",
        "asn",
        "holder",
        "country",
        "registry",
        "prefix",
        "allocated"
      ]
    }
  },
  "required": [
    "type"
  ]
}