---
title: IP ASN Lookup API
slug: ip-asn-lookup
url: https://apyhub.com/dosvak/service/ip-asn-lookup
provider: Dosvak LLC
categories: [Geolocation]
tags: [asn-lookup, rdap, ip-lookup, network-cidr, ip-enrichment, geolocation]
auth: api_key
---

# IP ASN Lookup API

Resolve an IP to ASN, network CIDR, registry, and network name via RDAP. Useful for enrichment, abuse checks, and network telemetry.

## Endpoints

| Method | Path | Description | Atoms |
| --- | --- | --- | --- |
| GET | `` | What it does Looks up RDAP-based ASN and network details for the IP address provided in the query s… | 10 |

## About

## What it does
IP ASN Lookup resolves an IP address to the network and registry details exposed by RDAP. Send an `ip` value and get back the IP, the ASN when available, the ASN registry, the network CIDR, the network name, the ASN description, and the ASN country code.

Use it when you need to identify who operates an address block, map traffic to an upstream network, or enrich security and network telemetry with ownership data. The response is intentionally compact, so it fits neatly into routing, abuse-checking, asset inventory, and analytics workflows.

Because the lookup is based on RDAP, results reflect registry data rather than guessed location or ISP information. That makes it useful for IP reputation checks, incident response triage, and backend tools that need a reliable ASN reference before making a decision.

If the registry does not expose a value, the corresponding field can be null, so you can handle partial results without guessing.

## Usage

Authenticate with an ApyHub API key in the `apy-token` header.
Full docs and a live playground: https://apyhub.com/dosvak/service/ip-asn-lookup