CardDav server address for use on iOS

Hi,

As we all know iCloud contacts cannot be shared with family members, other than adding the iCloud login, of the member which has the contacts (= me), to all devices of the family. My problem with this is that the family members can then turn on other content, like e-mail, of that account if they like. I don't want that. I only want them to have access to my contacts.

NB: I don't want to create a separate iCloud account for contacts. I need my contacts in my account for several reasons.

Therefore I was thinking of using the CardDav server address, so that they only have access to the contacts and not to other content. Is this possible and if so, what is the address / port?