Owner, or domain holder, is shown on central registry of domains. At most TLDs this information is public and can be found in so called WHOIS database.
WHOIS database are provided by individual central registrars and information, which are in WHOIS can be different at different TLDs.
Provided, however, that the domain owner is the person or company listed on the central domain registry - it doesn't necessary means the owner of user account, where the domain is listed or it's payer.
Change of domain holder
Changes at the most often used domains can be done electronically directly in Customer center in section Services/ Domains / Domain overview. There click on domain name and on next page choose option Changes on domain, after that you can edit individual data.
At .CZ domains the changes are made on identificator, which can be common for more domains. Change of owner can be made by identificator change.
Change of domain holder will be done after authorization from contact e-mail address, currently mentioned on central register (WHOIS).
If the e-mail address of previous owner is unavailable, it's necessary to make change of e-mail address first by paper form (download form).
Of the domain is in database of different registrator, or the change can't be made from customer center and you don't know what to do to change the holder information, contact us, and We'll try to help you.
Change of holder of some domains can be paid, in case of extra fee, You'll be informed during change.
During change of owner renewal of domain name is not made.
Who is the domain owner/holder?
Current domain owner can be found in database of central register WHOIS. Every registrator of TLD has its own database, it means, that domain owner of active24.cz can't be found on Eurid WHOIS, because it manages only .EU domains.