RDAP Lookup

RDAP Lookup: modern WHOIS replacement

RDAP (Registration Data Access Protocol) is the structured, JSON-based replacement for the legacy WHOIS protocol. Standardised in RFC 7480–7484, RDAP delivers machine-readable registry data over HTTPS with consistent field names across all registries.

What data does RDAP return?

• Domains — registrar, registration and expiry dates, nameservers, DNSSEC status, contact entities
• IP addresses — network block, allocation country, RIR region (ARIN, RIPE, APNIC, LACNIC, AFRINIC)
• ASNs — autonomous system name, operator contacts, routing policy information

Frequently asked questions

• What is RDAP and how does it differ from WHOIS?

  RDAP is a modern, JSON-based successor to WHOIS, defined in RFC 7480. Unlike WHOIS, RDAP provides structured machine-readable data, supports internationalized domain names, includes access control, and supports HTTPS. RDAP is now the preferred standard supported by all major registrars.

• Can I look up IP address ownership via RDAP?

  Yes. IP address and ASN data is served by Regional Internet Registries. RDAP queries for IP blocks return network name, country, allocation date and contact handles. Simply enter an IPv4 or IPv6 address in the form.

• What is an ASN in RDAP?

  An Autonomous System Number (ASN) identifies a network under unified routing policy on the internet. Enter an ASN as a plain number (e.g. 15169) or with the AS prefix (AS15169). RDAP returns the network name, operator contacts and registration dates.

See also

• WHOIS Lookup — legacy WHOIS data for domains
• DNS Lookup — A, MX, TXT, AAAA records
• IP Geolocation — country and ISP for any IP