Linkedin is a social Media website for Professional People.
It does not list the Czech Repubic phonenumbers like historic Whitepages
but profiles of individual people.
Connected to Linkedin you can send messages
to people from the Czech Repubic you found.
Linkedin was acquired by Microsoft.
As of 2020 August 1.792.000 people from the Czech Repubic
are connected to Linkedin.
More on the history of Microsoft
on the Brand Portal VB.com