whois exchange.prx.org/series/47775-professionelle-datenrettung-kosten-verfahren-und?

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exchange.prx.org/series/47775-professionelle-datenrettung-kosten-verfahren-und?
checking....exchange.prx.org/series/47775-professionelle-datenrettung-kosten-verfahren-und?
   $ whois exchange.prx.org/series/47775-professionelle-datenrettung-kosten-verfahren-und?
No whois server is known for this kind of object.