RDAP.org Lookup review
An open-source RDAP client with web access and a documented HTTP endpoint.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
RDAP.org Lookup is an open-source, browser-based RDAP client for developers who need structured registration and network lookups. It supports domain names, IP addresses, CIDR ranges, autonomous system numbers, TLDs, entities, registrars, URLs, and JSON objects. The product is available on the web and through an HTTP endpoint, making it suitable for both interactive research and programmatic queries.
Its platform fit is a central strength. The browser client sends queries directly to relevant RDAP servers over HTTPS rather than through a proxy, and it can optionally follow a referral to a sponsoring registrar's RDAP record. The documented endpoint at rdap.org supports programmatic RDAP queries, while the browser client is available at client.rdap.org. This combination gives developers a direct web interface alongside API access for applications, scripts, and internal tools.
The feature breadth is focused but useful within RDAP. Alongside standard domain lookups, the client includes IP and CIDR, ASN, TLD, entity, registrar, URL, and JSON lookup options. Direct browser-to-registry queries provide a clear path for inspecting registry responses, while open-source availability supports review and adaptation of the software. RDAP.org Lookup is a good choice for developers seeking an open RDAP endpoint and a broad set of lookup types. Teams looking for AI-assisted features or capabilities beyond the listed RDAP query functions should consider a different tool.
RDAP.org Lookup pros and cons
- Where it wins
- Covers domains, IPs, CIDRs, ASNs, TLDs, entities, and registrars
- Sends browser queries directly to relevant RDAP servers
- Offers a documented HTTP endpoint for programmatic queries
- Where it doesn't
- No AI features
- Focused on RDAP lookups rather than broader analysis tools
- Referral following is optional rather than part of every query
RDAP.org Lookup fact sheet, pricing and score →
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