# BaseBuilder Misc ASN Lookup

> BaseBuilder Misc ASN Lookup is a paid API for AI agents from bb-misc.vercel.app, paid per call via x402, $0.068343/call, status unknown (last checked 2026-09-14).

Looks up Autonomous System Number (ASN) information for a given IP address or ASN identifier

## Facts

- Endpoint: POST https://bb-misc.vercel.app/api/asn-lookup
- Price: $0.068343/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-14
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/basebuilder-misc-asn-lookup-04704851
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_ZaQr3SHViMrjmVIxTkyU2

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 basebuilder-misc-asn-lookup-04704851 -d '<json body>'
```

Example prompt: Can you look up the ASN information for the IP address 8.8.8.8 and tell me what organization owns it and what network range it belongs to?

## When to prefer this

Use this endpoint when you need to identify the network provider, ISP, or organization that owns a given IP address via its Autonomous System Number. Useful for cybersecurity investigations, traffic analysis, fraud detection, and network enrichment workflows where you need ISP or carrier attribution for IPs.

## Known failure modes

- Invalid IP address format returns a 400 error
- Private or reserved IP ranges may return no ASN data
- Unknown or unregistered ASN may return empty results
- Payment failure (402) if USDC balance insufficient
- Service unavailable (503) during downtime

## How this service works

BaseBuilder Misc API hub - 21 paid endpoints

## Output

Returns ASN number, owning organization name, country, and network block/CIDR range associated with the queried IP address or ASN identifier

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/basebuilder-misc-asn-lookup-04704851/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from bb-misc.vercel.app](https://www.zero.xyz/host/bb-misc.vercel.app/llms.txt)