It appears that running a whois on .DE domains returns almost no information. Using google.de as an example:
$ whois google.de % Restricted rights. % % Terms and Conditions of Use % % The above data may only be used within the scope of technical or % administrative necessities of Internet operation or to remedy legal % problems. % The use for other purposes, in particular for advertising, is not permitted. % % The DENIC whois service on port 43 doesn't disclose any information concerning % the domain holder, general request and abuse contact. % This information can be obtained through use of our web-based whois service % available at the DENIC website: % http://www.denic.de/en/domains/whois-service/web-whois.html % % Domain: google.de Nserver: ns1.google.com Nserver: ns2.google.com Nserver: ns3.google.com Nserver: ns4.google.com Status: connect Changed: 2018-03-12T21:44:25+01:00
I tried the referenced http://www.denic.de/en/domains/whois-service/web-whois.html site however it returns essentially the same contact (plus an abuse e-mail).
Is it simply impossible for someone other than the owner to look up the expiration date for one of these domains?