.lookup-client { display: none; }

JavaScript is required for RDAP Lookup

This tool loads IANA routing data and queries the selected registry from your browser, so it cannot run without JavaScript.

To query an RDAP server from the command line instead, follow the RDAP cURL guide.

Registration data from public RDAP services

RDAP Lookup for Domains, IP Addresses, and ASNs

Trace an internet resource to the RDAP service selected through IANA bootstrap data.

What this is

Registration data, without the middleman.

RDAP Lookup uses IANA's public bootstrap registries to find the authoritative operator for a resource. Queries run from your browser to that operator.

Reading room

Protocol notes

All guides

Oct 2026

October 2026 PHP vulnerabilities: reported impact on RDAP services

Track reported RDAP service disruption related to CVE-2026-109618 and CVE-2026-109619, including BookMyName's maintenance and restoration.

Oct 2026

RDAP proposal would give lookup tools more control over redirects

An October 13 IETF draft update describes how RDAP tools could request a related record or ask a server not to redirect, with limits on both options.

Oct 2026

RDAP’s proposed move from jCard to JSContact

How the proposed RDAP JSContact extension would change contact data, what lookup tools need to support, and how providers could transition from jCard.