RDAP.org Lookup
RDAP.org Lookup: An open-source RDAP client with web access and a documented HTTP endpoint. Ranked #13 of 27 in WHOIS Lookup Tools by our editors (7.4/10); pricing: Open source; best for developers wanting an open RDAP endpoint.
At a glance
- Editor score7.4 / 10
- PricingOpen source
- Best forDevelopers wanting an open RDAP endpoint
- Paid fromFree
- API accessFull
- Facts checked20 Sep 2026
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
Our verdict on RDAP.org Lookup
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.
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RDAP.org Lookup pricing
RDAP.org Lookup fact sheet
| Free plan | Not verified |
|---|---|
| Paid from | Free |
| API access | Full |
| Bulk lookup | Not verified |
| Historical WHOIS | Not verified |
| RDAP support | Yes |
| Monthly lookup limit | Not verified |
| Export formats | Not verified |
| Deployment | Cloud, Browser extension |
| Platforms | Web |
| Support | Email, Docs |
| Built for | Solo, Small business (editorial estimate) |
| Pricing | Open source |
| Website | client.rdap.org |
| Facts checked | 20 Sep 2026 |
Alternatives to RDAP.org Lookup
- WhoisDataCenterA broad WHOIS research service with useful free allowances and paid data products.9.4
- WhoisXML API WHOIS APIA broad lookup API with RDAP, parsed data, integrations, and a free tier.9.2
- WhoxyA pay-as-you-go WHOIS platform for high-volume lookups, history, reverse search, and datasets.9.0
See all RDAP.org Lookup alternatives →
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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
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