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🔒 256-bit encryption · Up to 3 subdomains · Trusted by all major browsers
Certificates › Premium SSL
Premium SSL · Multi-Subdomain

Protect 3 subdomains with strong TLS

Tailored for small to medium businesses.

The Premium SSL Certificate secures up to three fully-qualified subdomains under one certificate, with an optional OV upgrade and built-in Microsoft Exchange Autodiscover support for simplified email administration.

✓ Up to 3 subdomains ✓ Exchange / OWA support ✓ Optional OV upgrade ✓ Unlimited reissues
https://yoursite.com
A+
Security Rating
SSL.com · Organization Validated · Multi-subdomain coverage
Encryption
256-bit AES
Key Strength
2048-bit RSA
Protocol
TLS 1.3
Coverage
Multi-subdomain
Org Verified
Multiple subdomains
30-day guarantee
Get Premium SSL on ssl.com →
Premium SSL
from $99/yr
Up to 3 subdomains · 1 certificate
  • Up to 3 subdomains in one certificate
  • $10,000 warranty (OV upgrade to $1.25M)
  • 99% browser compatibility
  • Unlimited server licenses & reissues
  • Exchange & OWA via Autodiscover
  • Free SSL.com Smart Seal badge
Get Premium SSL → Not sure? Try the SSL wizard
Secure checkout on SSL.com · 256-bit encrypted

What is a Premium SSL Certificate?

A Premium SSL Certificate secures multiple subdomains with strong 256-bit encryption and 2048-bit key strength. Everything is managed through an easy-to-use portal, making setup and administration simple. Unlike standard DV certificates, Premium SSL not only encrypts data but also enhances brand reputation and builds customer trust — which is why it's a key component for e-commerce websites and professional organizations.

Why choose Premium SSL

OV trust across three domains, simplified

Up to 3 subdomains in a single certificate
$10,000 warranty (upgrade to OV for $1,250,000)
99% browser compatibility (Chrome, Firefox, Edge, Safari, Opera)
Unlimited server licenses, reissues & key pairs
Microsoft Exchange & OWA support via Autodiscover
Free SSL.com Smart Seal badge for visitor trust
Who is it for

Built for businesses protecting multiple properties

E-commerce with blog & store

3 separate domains in one certificate

Corporate with client portal

Main site + login + support

International brand sites

us.brand.com · eu.brand.com · uk.brand.com

Microsoft Exchange deployments

Outlook Web App & ActiveSync

Business impact

Fewer certificates, lower overhead

3 domains, 1 certificate

One OV certificate protects three separate domains — no per-domain certificates to track or renew separately.

OV trust on all properties

Every covered domain shows your verified company name when inspectors check the certificate details.

Exchange & Office ready

Compatible with Microsoft Exchange OWA, ActiveSync, and autodiscover for unified communications environments.

Questions

Frequently asked questions

What is a Premium SSL (OV UCC/SAN) certificate?
Premium SSL is an Organization Validated multi-domain certificate covering up to 3 domains by default. It is designed for businesses needing OV-level trust across multiple properties, including Microsoft Exchange environments.
How many domains does it cover?
The Premium SSL covers 3 domains (SANs) by default. Additional SANs can be added if needed, up to the plan maximum.
Is it compatible with Microsoft Exchange?
Yes. Premium SSL supports the OWA, ActiveSync, and autodiscover host names required by Exchange — ideal for organizations using Microsoft's email and collaboration stack.
What is Organization Validation (OV)?
OV certificates verify your organization's legal existence through business registration checks and phone confirmation. Your verified company name appears in the certificate's Subject field.
How long does OV validation take?
OV validation typically takes 1–3 business days. SSL.com verifies your organization's registration details against government databases before issuing the certificate.

Secure your subdomains the smart way

One certificate, three subdomains, professional-grade trust.

Get Premium SSL →Compare all plans