ASN + IP geolocation

Look up the Autonomous System (ASN), prefix, country, registry, and allocation date for an IPv4 address — or for a hostname (which is resolved first). Uses Team Cymru's free DNS-based IP→ASN mapping; no HTTPS upstream, no auth, no rate-limit headaches.

Input

Field	Type	Description
ip	string	IPv4 address to look up (mutually exclusive with host)
host	string	Hostname to resolve first (also accepts hostname/domain/url/email)

Example output

{
  "ip": "8.8.8.8",
  "asn": "AS15169",
  "owner": "GOOGLE",
  "prefix": "8.8.8.0/24",
  "country": "US",
  "registry": "arin",
  "allocationDate": "1992-12-01",
  "queriedAt": "2026-06-19T22:00:00.000Z"
}

Try it — see the 402 challenge (free)

curl -i -X POST https://agent402.tools/api/asn-info \
  -H "Content-Type: application/json" \
  -d '{"ip":"8.8.8.8"}'

The response is HTTP 402 Payment Required with exact payment requirements. Any x402 v2 client pays automatically and retries:

Paid call (JavaScript agent)

import { wrapFetchWithPayment } from "@x402/fetch";
import { x402Client } from "@x402/core/client";
import { registerExactEvmScheme } from "@x402/evm/exact/client";
import { privateKeyToAccount } from "viem/accounts";

const client = new x402Client();
registerExactEvmScheme(client, { signer: privateKeyToAccount(KEY) });
const payFetch = wrapFetchWithPayment(fetch, client);

const res = await payFetch("https://agent402.tools/api/asn-info", {
  method: "POST",
  headers: { "Content-Type": "application/json" },
  body: JSON.stringify({
    "ip": "8.8.8.8"
  }),
});

Wallet-only. This tool reaches the network/browser/storage, so it is paid in USDC via x402 (no proof-of-work tier).

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