A multi-domain SSL certificate (also called a SAN or UCC certificate) lets you secure several different domains with a single certificate — for example, yourcompany.com, yourcompany.mx, and yourcorporatesite.com all at once. In Mexico, prices range from roughly $800 to $6,000 MXN per year depending on the number of domains and the validation level.
If you manage more than one domain, this guide helps you decide whether a multi-domain SSL is what you need or whether a wildcard fits your situation better.
What Exactly Is a Multi-Domain SSL Certificate?
A standard SSL certificate secures one domain (and sometimes the www subdomain). A multi-domain certificate uses the Subject Alternative Name (SAN) extension to include a list of additional domains within the same certificate.
Each domain on that list is a "SAN." Most multi-domain certificates include 3 SANs by default and allow adding more (up to 100 or 250, depending on the provider) for an additional cost per SAN.
Difference from a Wildcard SSL
It's easy to mix them up, but they cover different needs:
| Feature | Multi-Domain SSL (SAN) | Wildcard SSL |
|---|---|---|
| What does it cover? | Multiple distinct domains (e.g., company.com, company.mx, store.com) | One domain + all its subdomains (e.g., *.company.com) |
| Covers unlimited subdomains? | No — only explicitly listed domains/subdomains | Yes — all subdomains of the root domain |
| Covers completely different domains? | Yes | No |
| Base price in Mexico | $800–$6,000 MXN/year | $700–$5,000 MXN/year |
The practical rule: if your additional sites live on different domains (.com, .mx, .net), you need a multi-domain certificate. If they all live under the same root domain (app.company.com, blog.company.com, store.company.com), a wildcard is more cost-effective.
Multi-Domain SSL Certificate Prices in Mexico (2025)
Prices vary based on the validation level (DV, OV, or EV) and the number of SANs included. Here's a realistic picture of the market:
| Type | Base SANs | Approx. Annual Price | Best For |
|---|---|---|---|
| Multi-domain DV | 3 | $800–$1,800 MXN | Informational sites, portfolios, blogs across multiple domains |
| Multi-domain OV | 3 | $2,000–$4,000 MXN | Mid-size companies, corporate sites with multiple domains |
| Multi-domain EV | 3 | $4,000–$8,000 MXN | High-volume online stores, banks, payment portals |
| Additional SAN (per extra domain) | +1 | $200–$800 MXN each | When you need more domains than the base SANs included |
Note: Providers like DigiCert, Sectigo (Comodo), GlobalSign, and GeoTrust are the most common in Mexico. Their prices are typically listed in USD — at the 2025 exchange rate, a basic Sectigo DV multi-domain certificate runs around $600–$900 MXN per year.
When Does a Multi-Domain SSL Make Sense?
These are the most common scenarios where a multi-domain certificate is the right call:
You Have the Same Site Across Multiple Domain Extensions
If you registered yourcompany.com, yourcompany.mx, and yourcompany.com.mx to protect your brand, you need SSL on all of them — a multi-domain certificate covers them all with one certificate and one renewal date.
You Manage Multiple Client Sites from the Same Server
Web agencies and freelance developers in Mexico who host multiple client projects on the same server can simplify management with a single multi-domain certificate instead of juggling individual certificates for each client.
Your Application Communicates with APIs or Services on Different Domains
If your main platform at app.yourcompany.com communicates with an API at api.yourcompany.net or an admin panel at admin.yourcompany.io, a SAN multi-domain certificate covers all those communication endpoints under one certificate.
Microsoft Exchange and Hybrid Email Environments
Microsoft Exchange servers, Office Communications, and hybrid email environments are the original use case for which UCC/SAN certificates were designed. If you manage corporate mail servers, a multi-domain certificate is almost always the manufacturer's recommendation.
How to Buy and Install a Multi-Domain SSL in Mexico
The process is similar to any other SSL, with one additional step when listing your domains:
- Define your domain list — include the primary domain and all the SANs you need to cover. You cannot add domains later without reissuing the certificate.
- Generate the CSR (Certificate Signing Request) — from your server or hosting control panel (cPanel, Plesk), specifying the primary domain.
- Purchase the certificate — choose your provider and validation level. For DV, validation is automated (DCV by email, DNS, or HTTP file). For OV/EV, the CA will verify your company.
- Install the certificate — upload the CRT file and CA bundle to your server. On Apache, you'll need a VirtualHost with
ServerAliasfor each domain. - Verify coverage — use a tool like SSL Labs to confirm all SANs are active and rated A or A+.
If the process seems complex, the team at elenlace.com handles the purchase, issuance, and installation of multi-domain SSL certificates for businesses in Mexico.
Is It Worth It Compared to Multiple Individual Certificates?
Let's compare the cost of protecting 3 domains using two different strategies:
| Strategy | Approx. Annual Cost | Certificates to Manage |
|---|---|---|
| 3 × individual DV SSL (Let's Encrypt) | $0 MXN | 3 (renewal every 90 days each) |
| 3 × paid individual DV SSL | $900–$1,800 MXN | 3 (annual renewal each) |
| 1 × Multi-domain DV SSL (3 SANs) | $800–$1,800 MXN | 1 (single annual renewal) |
The real advantage of a multi-domain SSL isn't always cost savings — it's operational simplicity: one renewal date, one installation process, and less risk of a domain going unprotected because someone forgot to renew its individual certificate.
For more context on certificate types and which to choose, see our SSL security guide.
Key Takeaways
- A multi-domain (SAN) SSL certificate protects several different domains with one certificate, starting at ~$800 MXN/year in Mexico.
- It differs from a wildcard: wildcard covers unlimited subdomains of one root domain; multi-domain covers completely different domains.
- DV, OV, and EV validation levels all exist in multi-domain form — choose based on the level of trust you need to convey to visitors.
- The main advantage isn't always price — it's operational simplicity: one renewal for all your domains.
- It's the ideal option for agencies, businesses with multiple brands or domains, and Microsoft Exchange server environments.
Need help choosing and installing the right certificate? The team at elenlace.com specializes in web security for Mexican businesses and can advise you at no cost.
FAQ
How many domains can I include in a multi-domain SSL?
It depends on the provider and plan. Most include 3 SANs by default and allow adding up to 100 or 250 additional domains at an extra cost per SAN. DigiCert and Sectigo offer the highest possible SAN counts.
Can I mix .com and .mx domains in the same certificate?
Yes, that's precisely the point of a multi-domain certificate. You can include yourcompany.com, yourcompany.mx, yourcompany.com.mx, and any other TLD in the same SAN list, regardless of the different extensions.
Does a multi-domain SSL affect SEO rankings?
Not directly. Google treats each domain separately regardless of which certificate protects it. What does impact SEO is having HTTPS active on all your domains — a multi-domain certificate makes it easier to ensure no domain is left unprotected.
What happens if I need to add a new domain after the certificate is issued?
You'll need to reissue the certificate with the new domain added to the SAN list. Most CAs allow free reissues during the certificate's validity period, but the process requires generating a new CSR and going through the domain validation process for the new domain.
Useful resources
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