Multi-domain (SAN/UCC) SSL certificate

sslTrus Multi-Domain Certificate

A multi-domain SSL certificate can protect multiple domain names (Subject Alternative Names), and therefore is also called SAN SSL or UCC SSL certificate. It supports adding multiple different main domains or subdomains, which is far more cost-effective than applying for each domain separately. It also simplifies the verification and renewal process and is the top choice for Exchange mail server encryption!

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https://www.yourdomain.com
SAN Extended Field Merge Resolution
Exchange Email Environment Adaptation
Multi-node unified issuance and authentication
sslTrus multi-domain Certificate

Manage from 3 up to hundreds of domains and subdomains with a single certificate, simplifying operational and procurement costs.

Ultra-fast Deployment Version

DV multi-domain certificate

One certificate protects multiple domain names. Only domain name verification is required, and the issuance speed is extremely fast.

¥1095Since /
  • Protect multiple domain names (subdomains), starting from 3.
  • Issued within minutes at top speed
  • Insurance amount of $500,000
  • RSA 2048/3072/4096 & ECC
  • 7*24 Expert Service
  • 30-day worry-free refund plan
Purchase now
Enhanced Verification Version

EV Multi-domain Certificate

Financial-grade protection is provided for all bound domain names, and the highest-level enterprise identity verification is required.

¥9720Since /
  • Protect multiple domain names (subdomains), starting from 3.
  • Strict review and issuance within 1 to 3 working days
  • Insurance amount of $1,750,000
  • RSA 2048/3072/4096 & ECC
  • 7*24 Expert Service
  • 30-day worry-free refund plan
Purchase now

How does an SSL certificate work?

Through a strict handshake protocol, an invisible and immediate encrypted channel is established between the client and the server.

1. Certification stage

When the client accesses the site, the server returns an SSL certificate. The browser automatically verifies the certificate authority (CA), validity period and domain name match.

2. Key Encryption

After the authentication is successful, the client generates a random "session key" and encrypts it using the public key that comes with the certificate, then securely sends it to the server.

3. Decryption and Communication

After receiving the encrypted data, the server decrypts it with its own private key to obtain the session key. From then on, all data is symmetrically encrypted and transmitted through this key.

Core Advantages

The underlying core advantages of the sslTrus multi-domain certificate

Skip the hassle of buying separate certificates for each domain—one SAN certificate covers your whole ecosystem with a powerful encryption foundation and outstanding management convenience.

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Low cost and expandable

Compared with purchasing multiple single-domain certificates separately, multi-domain certificates can significantly reduce procurement costs, and new SAN records can be expanded at any time in the future.

Multiple domain name management is convenient.

One certificate is simultaneously bound to dozens or even hundreds of completely different primary domains and subdomains, and the expiration time is uniformly monitored, greatly simplifying the renewal management.

The preferred email service is

Fully meet the official hard encryption requirements of multi-domain communication environments such as Microsoft Exchange Server and Office Communications Server.

Reliable safety protection and assurance

It is equipped with high-specification asymmetric and symmetric encryption algorithms as standard, and offers commercial security anti-counterfeiting compensation of up to one million US dollars based on the version level.

Ensure website compliance

Help various government, financial and e-commerce website clusters achieve the compliance requirements of the entire system with one click and smoothly pass industry data audits such as PCI-DSS.

Extensive multi-platform seamless compatibility

With an excellent multi-platform trust base, it is compatible with over 99.9% of mainstream web servers, legacy browsers and the latest mobile systems worldwide.

Enhancing the Security of enterprise websites

A SAN certificate endows complex application clusters with a unified digital defense shield, fully activating the security potential of the entire digital ecosystem.

Powerful data encryption

Establish a comprehensive strongly encrypted data tunnel for all bound different main domains and subdomains to block any possibility of network sniffing and data tampering.

Enhance the trustworthiness of the website

Mark the different brand lines and service interfaces under the group with a unified official genuine security imprint to effectively prevent the risk of counterfeiting and phishing, and build the trust of visitors.

SEO Ranking Optimization

Solve the HTTPS coverage of all domain names at one time, meet the priority inclusion and weight enhancement algorithms of mainstream search engines, and help the entire matrix achieve high traffic.

Eliminate browser warnings

Batch eliminate the "Unsafe" red interception warning that occurs during cross-system jumps to ensure an extremely smooth user experience during complex business flow processes.

User Privacy Protection

Whether it is the transaction flow of the main site or the data flow of the API domain, it can ensure that account passwords and sensitive privacy information meet the world's strictest data regulations.

Display the security lock level

All protected domain name address bars will be illuminated with an authoritative security lock symbol, invisibly transmitting a highly encrypted defense signal to each connection.

Frequently Asked Questions

How many domain names can a multi-domain name certificate protect at most?

By default, it includes several domain name quotas, which can be expanded as needed. For mainstream brands, a single certificate can bind up to approximately 250 domain names (SAN), fully covering the unified encryption requirements of multiple enterprise sites and multi-brand matrices.

Can multi-domain certificates provide mixed protection for different types of domain names?

Sure. One certificate can be mixed and bound to multiple completely different main domains and subdomains of any level (including cross-level subdomains such as a. mail.example.com), which is particularly suitable for multi-brand sites and email systems of groups. If you need to protect public IP addresses, please choose a dedicated IP SSL certificate.

Can a domain name be added after Certificate Issuance?

Sure. During the validity period of the certificate, you can add a new SAN domain name at any time by paying. After the CA verification is passed, the certificate will be reissued and the deployment will be replaced. The existing domain name will not be affected and there is no need to wait until the renewal fee to make adjustments.

What are the differences between multi-domain certificates and wildcard certificates?

Wildcards govern "an infinite number of subdomains at the same level as the same primary domain", while multi-domain governs "multiple completely different domain names". Multi-domain certificates support full verification levels of DV/OV/EV, while wildcards do not support EV. The two can also be combined into a multi-domain wildcard certificate, taking into account both scenarios.

Why is it considered the top choice for Exchange mail servers?

Exchange and Skype for Business need to protect multiple different hostnames such as mail, autodiscover, and owa simultaneously. Microsoft officially recommends using SAN/UCC certificates. A multi-domain certificate can cover all service domains, avoiding deployment conflicts and operations burdens caused by multiple certificates.

From Manual Certificate Operations to Automation

From SSL/TLS certificate discovery, enrollment and deployment to continuous monitoring, alerting and automatic renewal, sslTrus helps enterprises build a unified certificate automation platform—reducing the operational burden of growing certificate inventories and shorter validity periods.

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Global Overview
Total Certificates
12,458
Pending
34
Expiring in 30 Days
15
Expired
2
Automated Deployments · 30 Days
Expiration Risk · Next 6 Months
Overall Compliance Rate
96%

Certificates Meet the Latest Security Baseline

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