CardDAV Server Directory & Setup Guide
Connect any RFC 6352-compliant CardDAV server to Cloud Contacts or the free CC - CardDAV Contacts viewer. Browse tested server endpoints, guided auto-discovery URLs, direct address book paths, and authentication requirements.
Apple iCloud
Use your full Apple ID email as username and generate an App-Specific Password at appleid.apple.com under Sign-In and Security.
Fastmail
Use the full Fastmail email address and generate an app-specific password with Contacts/CardDAV access. Trial accounts may need SMS verification or a paid plan before CardDAV works.
Nextcloud
Use your Nextcloud username and account password, or create a dedicated App Password in Nextcloud Personal Settings → Security.
ownCloud
ownCloud 9+ uses /remote.php/dav/. Legacy ownCloud 4-8 uses /remote.php/carddav/addressbooks/{user}/contacts/.
Posteo.de
Use your full Posteo email address (e.g. [email protected]) and your Posteo password.
Mailbox.org
Use your primary Mailbox.org email address and password or dedicated device password.
Zoho Contacts (US & Global)
If Zoho MFA/2FA is enabled, generate an App-Specific Password at accounts.zoho.com → Security → App Passwords.
Zoho Contacts (EU Data Center)
For EU datacenter accounts (.eu domain). Requires App-Specific Password when MFA is enabled.
GMX Mail (.net / .com / .de)
Use your full GMX email address and password. Ensure CardDAV sync is enabled in GMX web settings.
Web.de
Enter your Web.de email and password. Enable CardDAV/CalDAV access in Web.de security options.
mail.de
Username is your full mail.de email address.
Synology NAS (Contacts / CardDAV)
Use your Synology DSM username and password. For HTTPS use port 8443, for HTTP use port 8008.
Baïkal
Enter your Baïkal user account credentials created in the Baïkal Admin panel.
Radicale
Radicale supports htpasswd, LDAP, and custom authentication plugins. Default port is 5232.
SOGo Groupware
Username is your corporate or LDAP mailbox identifier.
Zimbra Collaboration
Default address book name is usually 'contacts'.
DaviCAL
Enter DaviCAL username and password. Default address book path is /contacts/.
SabreDAV
Standard SabreDAV addressbookserver setup.
Yahoo! Mail
Must generate an App Password in Yahoo Account Security → Generate App Password. Regular password will be rejected.
AOL Mail
Generate an App Password in AOL Account Security settings.
Yandex Mail
Enable App Passwords under Yandex ID → Security → Passwords for Applications.
Namecheap PrivateEmail
Enter full Namecheap PrivateEmail address and mailbox password.
Strato WebMail
Enter your Strato email address and email account password.
IONOS / 1&1 Mail Business
Use your 1&1 / IONOS Mail Business username and password.
HostPoint Switzerland
Username is your full HostPoint email address.
T-Online (Telekom Germany)
Use your @t-online.de email address and dedicated email password.
Ziggo Netherlands
Use your Ziggo email and password.
Telstra Mail (Australia)
Use your full BigPond or Telstra email address.
cPanel Webmail (Horde / Roundcube)
Enter full email address and cPanel mailbox password. Port 2080 (SSL) or 2079 (non-SSL).
Kerio Connect
Guided discovery finds personal, shared, and public domain address books automatically.
CommuniGate Pro
Standard port is 9001 or 8010.
Horde Groupware / Kronolith
Supported on Horde version 5.1 and above.
EGroupware
Use EGroupware username and login password.
MOCO App (ERP / CRM)
MOCO provides a separate CardDAV-Password under User Profile → Integrations (not your main web password). Replace {SystemName} with your company subdomain.
Marketcircle Daylite
Server address and principal ID are available in Daylite Preferences → Contact Sharing pane.
Dolibarr ERP/CRM
Requires Dolibarr CardDAV module enabled.
IceWarp Messaging
Standard user mailbox credentials.
MailEnable
Configure HTTP/HTTPS binding in MailEnable administration.
Group-Office
Use Group-Office username and password.
luckycloud
Use your luckycloud user credentials.
Adding your CardDAV server to Cloud Contacts
Follow these simple steps on your iPhone, iPad, or Mac to synchronize your contacts across any CardDAV provider.
Choose your provider or select Custom CardDAV
In Cloud Contacts, tap Add Account. Choose your provider (e.g. Nextcloud, Fastmail, iCloud) from the list, or select Custom CardDAV Server.
Paste the Guided Server URL
Copy the Guided URL from the directory above. Enter your username (or email) and your account password (or dedicated App-Specific Password).
Auto-Discovery & Reviewed Synchronization
The app checks the secure connection, resolves available address-book collections, and shows supported changes before writing. Server capabilities determine which fields and group operations can be updated.
Frequently Asked Questions & Troubleshooting
Why does my login fail with an “Authentication Error”?
If your email provider (like Apple iCloud, Yahoo, AOL, Fastmail, Zoho, or Yandex) has Two-Factor Authentication (2FA) enabled, you cannot use your main login password. You must generate an App-Specific Password in your provider's security settings and paste it into Cloud Contacts.
What is the difference between Guided Mode and Direct Path?
Guided Mode performs RFC 6352 auto-discovery to find all address books under your account automatically. Direct Path connects directly to a specific address book folder, useful for self-hosted instances with custom URL rewrites.
Can I connect self-hosted servers with self-signed SSL?
Yes. Cloud Contacts adheres to iOS security policies. For self-signed certificates, install your server CA profile into iOS Settings → General → VPN & Device Management and enable Full Trust under Certificate Trust Settings.
Are my CardDAV server credentials safe?
Credentials and server tokens are stored in your device's secure system Keychain. Cloud Contacts sends them only to the CardDAV endpoint you configure; they are not routed through a Cloud Contacts credential service.