Registration Data Access Protocol

Tue, 24 Mar 2026 00:00:00 +0000

Registration Data Access Protocol (RDAP) is a successor to WHOIS protocol.

Pros

JSON format Supports HTTPS Unicode support Uniform schema unlike whois which differs from registry to registry

Rate limiting Authentication Tiered (restricted?) access

curl -Ls https://data.iana.org/rdap/dns.json

curl -Ls https://data.iana.org/rdap/ip.json

curl -Ls https://data.iana.org/rdap/cctld.json

For querying using web browser, use https://client.rdap.org/

curl -Ls https://rdap.org/domain/example.in | jq .

curl -Ls https://rdap.org/autnum/16276 | jq .

curl -Ls https://rdap.org/ip/1.1.1.1 | jq .

curl -Ls https://rdap.org/entity/APNIC | jq .