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About the RDAP Lookup

RDAP is the structured successor to Whois: the same registration data delivered as predictable JSON, with consistent fields across registries.

• Structured, machine-readable registration data
• Consistent field names across every registry
• Covers both domains and IP allocations

Frequently asked questions

How is RDAP different from Whois?

Whois returns free-form text that differs by registry. RDAP returns structured data with standard field names, so it is far easier to parse reliably.

Is RDAP replacing Whois?

Yes, gradually. Registries are required to run RDAP, and Whois is being retired over time.

Related tools

• Whois LookupLook up domain registration details: registrar, creation and expiry dates, nameservers and status codes. Whois lookup, no signup.
• Domain & IP LookupLook up everything about a domain or IP in one go: DNS records, Whois, geolocation, SSL and HTTP headers. Instant, no signup.
• ASN LookupLook up any autonomous system number to see its operator, announced prefixes and peers. BGP and routing information.
• DNS LookupLook up DNS records for any domain: A, AAAA, MX, TXT, CNAME, NS, SOA and more. DNS lookup with instant results.
• ISP LookupIdentify the ISP, hosting company or organisation that owns any IP address, plus its network range. Instant.
• Reverse DNS LookupRun a reverse DNS lookup to find the PTR hostname for any IPv4 or IPv6 address. Essential for mail server checks. Instant.

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