# ASN Info Lookup (RIPEstat)

> ASN Info Lookup (RIPEstat) is a paid API for AI agents from api.vextorium.com, paid per call via x402, $0.003/call, status unknown (last checked 2026-10-20).

Returns structured information about an autonomous system number (ASN): holder name, route announcement status, registry block, prefix counts, approximate IPv4 addresses, and a sample of announced prefixes, sourced from RIPEstat.

## Facts

- Endpoint: POST https://api.vextorium.com/asn-info-pago?utm_source=zero.xyz
- Price: $0.003/call
- Payment: x402
- Status: unknown
- Last checked: 2026-10-20
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/asn-info-lookup-ripestat-dbd1feec
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_SOLSnV8guptYrJC1yRvGn

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 asn-info-lookup-ripestat-dbd1feec -d '<json body>'
```

Example prompt: Look up ASN 13335 for me — I want to know who holds it, whether it's currently announcing routes, how many IPv4 and IPv6 prefixes it has, and a few example prefixes.

## When to prefer this

Choose this endpoint when you need structured, parsed ASN metadata including prefix counts, holder identity, and route announcement status in a single call, backed by RIPEstat data. Prefer this over raw WHOIS lookups when you need machine-readable output with IPv4/IPv6 prefix statistics and sample prefixes without parsing raw registry text.

## Known failure modes

- Invalid or non-existent ASN returns null fields or an error response
- ASN that exists in registry but announces no routes returns anuncia: false with zero prefix counts
- Network timeout from upstream RIPEstat API results in a service error
- Malformed ASN string input (e.g. non-numeric) may return a validation error

## How this service works

Information about an autonomous system: holder, whether it announces routes, registry block, number of IPv4 and IPv6 prefixes announced, approximate IPv4 addresses and a sample of prefixes. RIPEstat data.

## Output

A JSON object containing: the ASN number, the registered holder name (titular), the registry block assignment (bloque), a boolean indicating whether routes are announced (anuncia), the data source (fuente, always RIPEstat), the count of announced IPv4 and IPv6 prefixes, the approximate number of IPv4 addresses, and a sample array of announced prefix CIDRs.

## Request schema (JSON Schema)

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

## Response schema (JSON Schema)

```json
{
 "type": "json",
 "example": {
  "asn": 13335,
  "bloque": "Assigned by ARIN",
  "fuente": "RIPEstat (RIPE NCC)",
  "anuncia": true,
  "titular": "CLOUDFLARENET - Cloudflare, Inc.",
  "prefijos_ipv4": 2478,
  "prefijos_ipv6": 3057,
  "muestra_prefijos": [
   "104.28.1.0/24",
   "162.158.106.0/24"
  ],
  "direcciones_ipv4_aprox": 1498368
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/asn-info-lookup-ripestat-dbd1feec/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)