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). Send POST /api/asn-info with no required fields (2 optional) and pay $0.001 per call over x402 or MPP (there is no free tier). It returns a JSON object with ip, asn, owner, prefix, country and 3 more.

Uses Team Cymru's free DNS-based IP→ASN mapping; no HTTPS upstream, no auth, no rate-limit headaches.

Category: Network & domains · Tags: security network geolocation asn · Also found as: ip-geolocation geoip ip-lookup geolocate-ip ip-location

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Parameters

Example request

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

Without payment this returns HTTP 402 Payment Required with the exact price for asn-info; any x402 v2 or MPP client pays it and retries.

Example response

{
  "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"
}

From an MCP client

catalog.call {
  "slug": "asn-info",
  "params": {
    "ip": "8.8.8.8"
  }
}

The hosted connector at https://agent402.tools/mcp needs a payment for asn-info; the stdio package pays it from a wallet or from AGENT402_CREDITS_KEY. Local install: npx -y agent402-mcp.

Errors and behavior

• Every field is optional. An input the tool rejects returns an HTTP 4xx whose body carries error, tool, expected, required and example.
• A paid call that ends in any status of 400 or above is not charged over x402, MPP or a prepaid credits key: settlement is cancelled when the tool fails. The exception is a Tempo push credential, a transfer the buyer sent before the call: it settles before the tool runs, so if the tool then fails the payment is recorded as a refund owed to the paying wallet.
• Wallet-only: this tool reaches the network or stored state, so it has no proof-of-work tier. A prepaid card-credits key issued earlier (Authorization: Bearer a402_...) also pays it.
• A GET or HEAD to /api/asn-info returns the same 402 quote, so the price can be read without a body.
• An Idempotency-Key header makes a retried paid call replay the first 200 instead of charging again (an answer larger than 1 MB is not replayed).

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();
client.setSpendControls?.(false); // keep your own spending ceiling in code
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"
  }),
});

Part of these workflows

ASN + IP geolocation is one step in these 2 skill packs, each sold as a single call:

• DNS & network ops - End-to-end DNS health check: records, multi-resolver propagation, WHOIS, ASN, robots.txt, and reachability.
• Fraud signals - Is this domain trustworthy, or is it a phishing site / typosquat / scam? Pull the reputation signals an analyst checks before clicking anything: domain age, cert issuance history, hosting reputation, DNS topology, tech-stack fingerprint, and page-content red flags. Different from a security audit - this is about whether the domain is what it claims to be.

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