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When I search whois data for some domains for example, liquid-solutions.biz, I get the following:

Registrant Email: Please query the RDDS service of the Registrar of Record identified in this output for information on how to contact the Registrant, Admin, or Tech contact of the queried domain name.

What does this mean and how to query RDDS service?

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The short answer is, right now there is no centralized place to go and run an RDDS query. The GDPR became a thing and ICANN changed some rules around in a hurry. They were already planning on eventually replacing WHOIS with a different system with more privacy barriers. As of May 2018 you can make your domain name information completely private if you want to, depending on who you register with, rather than using a proxy service in combination with your domain name.

At the time of writing, 12/2018, temporary gTLD specifications: https://www.icann.org/resources/pages/gtld-registration-data-specs-en If you do a word search on that page for "privacy" it will highlight some sections that directly relate to RDDS.

More about RDDS: https://www.icann.org/resources/pages/rdds-labeling-policy-2017-02-01-en

Previous RDDS Policy was rescinded: https://www.icann.org/rdds-labeling-display

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