---
title: "Look up an ASN in the public registry"
method: GET
path: "/{org_slug}/asns/registry-lookup"
tags: ["IPAM"]
---

# Look up an ASN in the public registry

`GET /{org_slug}/asns/registry-lookup`

## Request

- Base URL: `https://api.obelinf.com`
- URL: `https://api.obelinf.com/{org_slug}/asns/registry-lookup`
- Auth: HTTP bearer

Resolve the registered name for a public ASN via RDAP. Private and reserved ASNs return a null name without an external lookup.

## Path parameters

- `org_slug` string, required

## Response `200`

Registry lookup result

- object
  - `asn` number, required
  - `class` string, required
  - `name` string, nullable
  - `rir` string, nullable

## Other responses

- `400`: Invalid ASN

---

[API](https://skmtc.dev/obelinf/apis/obelinf-api.md) · [All operations](https://skmtc.dev/obelinf/apis/obelinf-api/llms.txt) · [OpenAPI document](https://skmtc.dev/obelinf/apis/obelinf-api/revisions/463fcf791828?raw)