# Vextorium ASN Info Lookup

> Vextorium ASN Info Lookup is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-19).

Returns detailed information about an Autonomous System Number (ASN) including holder name, IP prefix counts, block source, and sample prefixes.

## Facts

- Endpoint: POST https://api.vextorium.com/v1/asn-info?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-19
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/vextorium-asn-info-lookup-f7c9e25a
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_7uXCYZ8h8q5lDMiXK3gl2

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability vextorium-asn-info-lookup-f7c9e25a -d '<json body>'
```

Example prompt: Can you look up ASN 13335 and tell me who owns it, how many IPv4 and IPv6 prefixes they have, and what registry block it's assigned from?

## When to prefer this

Use this endpoint when you need structured, multi-field ASN intelligence in a single call — including holder identity, prefix counts, block source, and sample prefixes — rather than a simple WHOIS lookup or raw registry query. Ideal for network enrichment pipelines, threat intelligence workflows, and IP infrastructure analysis where you need reliable, parsed data without scraping registries yourself.

## Known failure modes

- Invalid or non-existent ASN returns null fields or an error
- ASN string not formatted correctly may cause a validation error
- Unassigned or reserved ASNs may return empty or null holder/block fields
- RIPEstat upstream outage may result in stale or unavailable data

## How this service works

558 pay-per-call data APIs for AI agents: Solana and EVM on-chain data, tokenized stocks, DeFi, Hyperliquid, economy and official statistics, FX, validation, web and developer tools. Pay in USDC via x402.

## Output

A JSON object containing the ASN integer, the registered holder organization name, the block assignment source and regional registry, the data source (e.g. RIPEstat), a boolean indicating whether the ASN is actively announcing prefixes, the count of IPv4 and IPv6 prefixes, an approximate count of IPv4 addresses, and a sample list of announced IP prefixes.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "asn": {
   "type": "string"
  }
 }
}
```

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asn": 13335,
  "block": "Assigned by ARIN",
  "holder": "CLOUDFLARENET - Cloudflare, Inc.",
  "source": "RIPEstat (RIPE NCC)",
  "announces": true,
  "ipv4_prefixes": 2478,
  "ipv6_prefixes": 3057,
  "prefixes_sample": [
   "104.28.1.0/24",
   "162.158.106.0/24"
  ],
  "ipv4_addresses_approx": 1498368
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/vextorium-asn-info-lookup-f7c9e25a/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from api.vextorium.com](https://www.zero.xyz/host/api.vextorium.com/llms.txt)