joomla site customers can protect their personal information with our service called Domain ID Protect.
You can order this feature from your User Area -> Add Services -> Domain Privacy.
The Domain ID Protect feature protects your personal details from being publicly available in the Whois database and makes the contact information related with your domain name private.
In other words, you would be able to hide your name and organization, address, phone, email address, etc, which will be otherwise accessible through public domain Whois queries.
Please note that after the European Data Protection Regulation (applicable as of May 25th 2018) was enforced, the Domain ID protect is available for free of charge for all SiteGround’s customers owning a .IT domain registered or transferred with/to us. In order to use it, the service has to be enabled from SiteGround’s User Area > My Accounts and then “Manage”, next to the domain you wish to enable/disable said service.
In case the domain is owned by an individual, all owner’s data will be hidden in case of withheld consent to the publication. Therefore the only information shown will be the Registrar and the registration/expiration date.
On the other hand, in case the domain is owned by a legal entity (e.g company etc) the “Organisation” field will be publicly visible. While address, e-mail address and telephone number will still be hidden.
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destination source:https://www.siteground.com/kb/how_do_i_hide_my_personal_information_in_the_domain_name_who/