Multi-Domain SSL Certificate — One Certificate for All Your Domains

A multi-domain SSL certificate uses the Subject Alternative Name (SAN) extension to list multiple domain names within a single certificate. When a browser connects to any of the listed domains, the certificate is recognized as valid. This means one certificate can simultaneously cover example.com, example.org, example.net, myotherbrand.com, and any other domains you add.

Unlike wildcard certificates that cover subdomains of a single domain, multi-domain certificates cover entirely different domain names. You can mix top-level domains (.com, .org, .net, .io), include both www and non-www versions, and combine root domains with subdomains. The flexibility is nearly unlimited within the maximum domain count.

AnubizHost multi-domain certificates start with coverage for 3 domains and can be expanded to 250 domains at any time. Adding a new domain to your certificate requires a brief reissuance process that typically completes in minutes for DV certificates. You can add and remove domains throughout the certificate's lifetime without purchasing a new certificate.

Individual DV certificates at $9 each add up quickly when you manage many domains. Ten domains at $9 each cost $90 per year with ten separate management tasks. A multi-domain certificate covering those same ten domains costs $59 per year — a 35% saving with 90% less management overhead.

The savings increase with scale. Agencies managing 50 client domains save over $300 per year compared to individual certificates, while also eliminating the operational risk of forgetting to renew any single certificate. One expiration date, one renewal process, one installation — for every domain on the certificate.

Multi-domain certificates also simplify server configuration. Instead of configuring your web server with multiple certificates, virtual hosts, and SNI mappings, you install one certificate that covers all domains on the server. This reduces configuration complexity and the potential for misconfiguration that could cause SSL errors for some domains.

Web agencies and freelancers managing multiple client websites benefit enormously from multi-domain certificates. Secure every client domain from a single certificate, manage renewals in one place, and avoid the administrative burden of tracking dozens of individual certificates with different expiration dates and payment methods.

Businesses operating multiple brands under one parent company can use a multi-domain certificate to secure all brand domains with a single certificate. This is particularly useful for Microsoft Exchange and Office 365 deployments where the UCC (Unified Communications Certificate) must cover autodiscover, OWA, ActiveSync, and other service domains.

SaaS platforms that allow customers to use custom domains can use multi-domain certificates to secure customer domains without provisioning individual certificates for each one. As customers add or remove their domains, the certificate is updated accordingly. This approach scales efficiently up to 250 domains per certificate.

Your AnubizHost dashboard provides a clear view of every domain covered by your multi-domain certificate. Add new domains with a few clicks — enter the domain name, complete DV validation, and the updated certificate is issued and installed automatically. Removing a domain is equally straightforward and triggers immediate reissuance.

When your multi-domain certificate approaches renewal, all domains are renewed together in a single process. Our auto-renewal system re-validates each domain and issues a new certificate covering all of them. If any domain fails validation — for example, because DNS has changed — we notify you and renew the remaining domains while you resolve the issue.

For programmatic management, our API supports multi-domain certificate operations including adding domains, removing domains, listing covered domains, and triggering manual renewal. Integrate certificate management into your provisioning workflows to automatically add SSL coverage whenever a new domain is configured on your infrastructure.