Domain Validation Digital Certificate (Server) with “Multi-domain” feature

Domain Validation (DV) Digital Certificate (d-Cert) (Server) with “Multi-domain” feature provides standard SSL/TLS encryption for up to 50 server names across multiple distinct domains owned by the Subscriber Organisation, following verification of the applicant’s control over the relevant domains. It enables secure HTTPS connections, removes “Not Secure” warnings displayed by web browsers, and delivers a basic level of data protection. The certificate is offered with a one‑year subscription period.​

​During the one‑year subscription period, subscribers are entitled to obtain an unlimited number of new d-Cert (Server) certificates under the same application at no additional charge. The validity period of each newly issued certificate will be subject to either the phased maximum validity period or the remaining subscription period, whichever is shorter.​

Server names may span multiple domain names owned by the Subscriber Organisation. For example, a d-Cert (Server) with the “Multi‑domain” feature may be used to secure the following server names across different domains:​

  • www.hkca.hk
  • hkca.hk
  • www.hkirc.hk

Note:

  1. A d-Cert (Server) with the “Multi‑domain” feature identifies one server name by default. Where more than one, but no more than 50, server names are required, all additional server names must be specified in the application, and an additional subscription fee applies per additional server name.​
  2. Wildcard characters (i.e. the asterisk “*”) are not permitted as part of any server name.​
  3. All server names are fixed upon issuance and cannot be changed thereafter.​
  4. The certificate includes digital signature key usage, the Subject Alternative Name (SAN) field, and the Extended Key Usage field. For details, please refer to Appendix B of the Certification Practice Statement (CPS).​
  5. Digital signatures supported by the d-Cert (Server) with the “Multi‑domain” feature are intended solely for server authentication and the
    establishment of secure communication channels. They must not be used for contract negotiations, legally binding agreements, or monetary transactions.

Eligibility for DV d-Cert (Server) with “Multi‑domain” ​

A DV d-Cert (Server) with “Multi‑domain” feature is intended for individuals, organisations, and businesses that operate multiple domain names and require basic SSL/TLS encryption for securing communications between users and servers. It is suitable for website owners who need to confirm control over multiple domains and protect them under a single digital certificate, without requiring verification of the organisation’s legal identity.​

​This certificate is commonly used by organisations managing multiple websites, brand domains, or service domains, where foundational encryption and secure HTTPS connections are required across different domain names.​

Document required for the DV d-Cert (Server) application

  •  Copy of proof of ownership of all the applied domain name(s) to be included in the certificate

If the Applicant is a company registered in Hong Kong :

  • Copy of Business Registration Certificate issued by the Inland Revenue Department
  • Copy of Certificate of Incorporation / Certificate of Registration issued by the Companies Registry (applicable to limited companies)
  • Completed, signed and stamped Authorisation Letter designating the authorised representation

If the Applicant is a bureau or department of the HK SAR Government :

  • A memo signed by the Departmental Secretary (or staff at equivalent rank or above) and endorsed with department chop designating the Authorised Representative

If the Applicant is statutory body in Hong Kong :

  • Copy of the ordinance(s) under which the statutory body was established
  • Completed, signed and stamped Authorisation Letter.

 

Benefits of Using a DV d-Cert (Server) with “Multi‑domain” ​

The use of a DV d-Cert (Server) with “Multi‑domain” feature enables website owners to encrypt data transmitted between users and servers using standard SSL/TLS technology while securing multiple domain names within a single certificate. It supports HTTPS connections, removes “Not Secure” warnings in common web browsers, and provides consistent level of data confidentiality and integrity across all protected domains.  ​

​In addition, a Multi‑domain DV d-Cert (Server) simplifies certificate administration by reducing the need to manage separate certificates for each domain, improves operational efficiency, and provides a cost‑effective solution for securing multiple websites where high‑assurance organisational identity verification is not required.

Click here to log in d-Cert Subscriber Portal to register or submit d-Cert (Server) application.