Look up an AS number via IANA → RIR referral (ARIN/RIPE/APNIC).
What this tool does
Queries IANA which refers to the appropriate regional RIR (ARIN for North America, RIPE for Europe, etc.). Returns ASN, organization, country, description, allocation/update dates, network/CIDR. Pure WHOIS, no credentials.
Input data
| Parameter | Required | Example | Description |
|---|---|---|---|
asn | Yes | AS13335 | AS number to look up (for example `AS13335`). |
Output data
| Field | Description |
|---|---|
asn | AS number returned. |
org | Organization that owns the AS. |
country | Country registered for the AS. |
description | Description of the AS. |
updated | Last update date in the registry. |
allocated | Allocation date in the registry. |
network | Network/CIDR associated with the AS. |
error | Error message when the lookup fails. |