Given an internet address (IP) or a network identification number (ASN), this tool returns
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.
10000 (raw units)
price
4
calls / 30d
4
unique payers
2026-09-14
updated
Provider
asn-lookup.underscoredone.com · discovered, not yet claimed by its owner
Payment (x402 accepts[])
[
{
"scheme": "exact",
"network": "eip155:8453",
"payTo": "0xE9740820225B3918b4ddd1292C7cA4Ca0e2C2F08",
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"amount": "10000",
"maxTimeoutSeconds": 300
},
{
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"payTo": "8ugAWAXDB8V18kiUrGZTq1oMvU3C6Fxs8hfC6rvzQT3b",
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"amount": "10000",
"maxTimeoutSeconds": 300
}
]Output schema
{
"bazaar": {
"info": {
"input": {
"body": {
"query": "8.8.8.8"
},
"bodyType": "json",
"method": "POST",
"type": "http"
},
"output": {
"example": {
"allocated": "1992-12-01",
"api_version": "1.0.0",
"asn": "AS15169",
"country": "US",
"holder": "GOOGLE",
"prefix": "8.8.8.0/24",
"query": "8.8.8.8",
"registry": "arin"
},
"type": "json"
}
},
"schema": {
"$schema": "https://json-schema.org/draft/2020-12/schema",
"properties": {
"input": {
"additionalProperties": false,
"properties": {
"body": {
"additionalProperties": false,
"properties": {
"query": {
"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.",
"type": "string"
}
},
"required": [
"query"
],
"type": "object"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"type": {
"const": "http",
"type": "string"
}
},
"required": [
"type",
"method",
"bodyType",
"body"
],
"type": "object"
},
"output": {
"properties": {
"example": {
"properties": {
"allocated": {
"type": "string"
},
"api_version": {
"type": "string"
},
"asn": {
"type": "string"
},
"country": {
"type": "string"
},
"holder": {
"type": "string"
},
"prefix": {
"type": "string"
},
"query": {
"type": "string"
},
"registry": {
"type": "string"
}
},
"required": [
"api_version",
"query",
"asn",
"holder",
"country",
"registry",
"prefix",
"allocated"
],
"type": "object"
},
"type": {
"type": "string"
}
},
"required": [
"type"
],
"type": "object"
}
},
"required": [
"input"
],
"type": "object"
}
}
}Use it
curl
curl "https://asn-lookup.underscoredone.com/lookup" # -> 402 Payment Required, accepts[] lists how to pay # retry with a PAYMENT-SIGNATURE (or PAYMENT header) once paid
JavaScript
const res = await fetch("https://asn-lookup.underscoredone.com/lookup");
if (res.status === 402) {
const { accepts } = await res.json();
// pay one of accepts[] via an x402 client, then retry with the payment header
}Python
import httpx
res = httpx.get("https://asn-lookup.underscoredone.com/lookup")
if res.status_code == 402:
accepts = res.json()["accepts"]
# pay one of accepts[] via an x402 client, then retry with the payment headerMachine-readable
Everything on this page is also available as clean JSON at /resources/3244.json, and this resource appears in /discovery/resources and /discovery/search.