Trustico® CaaS DV + Wildcard + Multi Domain Information

Trustico® CaaS DV + Wildcard + Multi Domain is a multi-domain and wildcard SSL Certificate delivered through Trustico® Certificate as a Service (CaaS). It secures a primary domain, additional names held as Subject Alternative Names (SANs), and wildcard names that cover every subdomain at a chosen level, all on one SSL Certificate.

The SSL Certificate is issued and reissued automatically through the Automatic Certificate Management Environment (ACME) protocol, which brings programmatic management to a widely trusted SSL Certificate. Coverage runs from a few names to hundreds, and a wildcard entry such as *.example.com secures unlimited subdomains beneath it.

It suits a business running several websites alongside subdomain-heavy platforms, where named sites and whole subdomain trees are provisioned and retired through automation rather than by hand.

Secures Multiple Domain Names 🔗	Secures Unlimited Subdomains 🔗
USD $500,000 Relying Party Warranty 🔗	Instant Domain Control Validation 🔗
Programmatic Management	Includes Hosted Issuance Tool 🔗
Includes Trustico® Site Seal 🔗	2048-bit Industry Standard SSL Certificate
Automated Installation	Unlimited Reissue Policy 🔗
99.9% Web Browser Ubiquity 🔗	Unlimited Server Licenses

The sections below explain what the SSL Certificate covers, how the automation works, and how to put it in place.

Named Sites and Subdomains on One Automated SSL Certificate

This SSL Certificate combines two kinds of coverage on one SSL Certificate. Separate names are held as Subject Alternative Names (SANs), which can be different domains such as example.com, example.net, and another-brand.com, along with individual subdomains.

A wildcard entry such as *.example.com then secures every subdomain directly beneath that domain, including ones you create later, and the root domain is included. Coverage of named sites runs from a few names to hundreds. Explore Multi Domain Coverage 🔗

Each wildcard label position is covered by its own wildcard entry, so you can include a wildcard for more than one domain when your platform needs it. Understand Wildcard Coverage 🔗

The Case for Certificate as a Service (CaaS) with Many Names

Managing an SSL Certificate that spans several domains and whole subdomain trees by hand grows awkward as the list changes. Each time it nears expiry, someone generates a Certificate Signing Request (CSR), completes validation for every name, downloads the files, and installs them on each server. Certificate as a Service (CaaS) automates all of that.

When you order Trustico® CaaS DV + Wildcard + Multi Domain, you are buying an SSL Certificate license for a set period. Through that period your ACME client reissues the SSL Certificate as it approaches expiry, so every name and subdomain stays protected for the term.

When the license nears its end, you can extend it without reinstalling or reconfiguring anything across your servers. The extended validity is recognized automatically, with no change to your External Account Binding (EAB) credentials or your automation. Learn About License Extensions 🔗

Validation with ACME

Trustico® CaaS DV + Wildcard + Multi Domain uses the Automatic Certificate Management Environment (ACME) protocol, defined in RFC 8555, to run the SSL Certificate lifecycle. An ACME client on your server handles verification, issuance, installation, and reissue for every name on the SSL Certificate.

Domain Validation (DV) confirms control of each name, with no organization checks, so the SSL Certificate issues quickly once every name is confirmed. Each name is validated on its own, and names on different servers can be confirmed independently.

For a named site, the client answers a challenge by serving a token over HTTP or by publishing a Domain Name System (DNS) TXT record. A wildcard entry is always validated through Domain Name System (DNS), because the Certificate Authority (CA) must confirm control of the base domain rather than a single server.

Because a wildcard uses Domain Name System (DNS) validation, your ACME client needs to support a Domain Name System (DNS) challenge, which most complete through provider integrations such as Cloudflare, AWS Route 53, and DigitalOcean. Explore ACME Protocol Details 🔗

Supported ACME Clients

Any major Automatic Certificate Management Environment (ACME) client that supports Domain Name System (DNS) validation works with Trustico® CaaS DV + Wildcard + Multi Domain. Certbot is the most widely used and covers wildcards through its Domain Name System (DNS) plugins. acme.sh suits scripted, scheduled reissue with a wide range of provider integrations.

For Kubernetes, cert-manager issues and reissues the SSL Certificate as a native cluster resource. Windows environments are covered by win-acme and Certify The Web for Microsoft Internet Information Services (IIS), while lego, dehydrated, and Posh-ACME cover Go, shell, and PowerShell setups.

Whichever client you choose, it authenticates with the Certificate Authority (CA) through the same External Account Binding (EAB) process and validates each name before the SSL Certificate is issued. Find Out More About Supported ACME Clients 🔗

On cPanel hosting the plugin fills the role of the ACME client, requesting and reissuing the SSL Certificate for the names and subdomains you manage on that server.

These are not either-or choices. Your Certificate as a Service (CaaS) license allows unlimited SSL Certificate issuance for its domain names, and the same External Account Binding (EAB) credentials drive an ACME client, the cPanel Plugin, and the hosted issuance tool alike. More than one method can be in use at the same time, and you can move between them at any point during your license period.

External Account Binding Credentials

External Account Binding (EAB) links your ACME client to the Certificate Authority (CA). Trustico® creates a Key Identifier and an HMAC Key and sends them to you via e-mail after purchase, and they are also available in your ordering account for a limited time. You provide them when you first set up the client to authorize it.

Your External Account Binding (EAB) credentials can be used to set up clients on different servers or environments, which helps where the same group of names is managed by more than one client across production, staging, and development. View Our EAB Credential Setup Guide 🔗

Encryption and Protocols

Trustico® CaaS DV + Wildcard + Multi Domain uses a 2048-bit RSA key with 256-bit symmetric encryption, applied consistently to every name and subdomain, over the Transport Layer Security (TLS) 1.2 and 1.3 protocols with SHA-256 hashing.

Certificate Transparency logging adds accountability, and Elliptic Curve Cryptography (ECC) keys are supported for environments that benefit from smaller keys and faster handshakes. Compare Encryption Standards 🔗

Preparing for Shorter Validity Periods

Industry rules are reducing the maximum validity of an individual SSL Certificate to 200 days from March 2026, 100 days from March 2027, and 47 days from March 2029. These reductions apply to every publicly trusted Certificate Authority (CA).

At a 47 day cycle, an SSL Certificate covering many names and subdomains across several servers would need reissuing roughly eight times a year. With Certificate as a Service (CaaS), your ACME client handles each reissue quietly, so everything stays protected whatever the validity period. Explore Traditional and Certificate as a Service (CaaS) Compared 🔗

USD $500,000 Warranty

Every Trustico® CaaS DV + Wildcard + Multi Domain SSL Certificate carries a USD $500,000 Relying Party Warranty covering the secured names and subdomains, which provides financial cover in the unlikely event that the Certificate Authority (CA) issues the SSL Certificate in error. Reissues are unlimited across the license through the automation. Review Warranty Details 🔗

Trustico® Site Seal

Your order includes a complimentary Trustico® site seal that you can display across your secured sites to reassure visitors. It works well on payment, sign-up, and contact pages. Explore the Trustico® Site Seal 🔗

Browser Compatibility

Each secured name and subdomain is trusted by around 99.9% of web browsers, including Chrome, Firefox, Safari, and Edge, and by mobile devices on iOS and Android without any additional configuration. Understand Browser Compatibility 🔗

Unlimited Server Licenses

You can install the SSL Certificate on as many servers as you need at no extra cost. This matters when your names and subdomains run on separate infrastructure, across web servers, application servers, load balancers, and container nodes.

The same SSL Certificate and key file are deployed to each server that serves a secured name, and where a server needs its own key you can reissue as often as required through the automation.

Programmatic Installation

The ACME client installs the SSL Certificate for you, generating the Certificate Signing Request (CSR), completing validation for each name, and deploying the issued files. Documentation covers Apache, Nginx, Microsoft Internet Information Services (IIS), cloud platforms, and container systems. Access Installation Guides 🔗

Guides and Resources

Trustico® provides guides covering ACME client setup, Domain Name System (DNS) validation, External Account Binding (EAB) credentials, and combined wildcard and multi-domain deployment. For reissue scheduling specific to your client, refer also to that client's own documentation. Browse Technical Resources 🔗

Who Should Use Trustico® CaaS DV + Wildcard + Multi Domain

It fits a business that runs several websites alongside subdomain-heavy platforms, provisioned through infrastructure as code with tools such as Terraform, Ansible, and CloudFormation.

It also suits agencies and hosting providers securing many client domains and their subdomains under a single automated SSL Certificate, and SaaS platforms that assign customer subdomains such as client.yourdomain.com. Learn About the Partner Service 🔗

Other Options

If you only need wildcard coverage of subdomains without additional named sites, the wildcard option secures a domain and everything beneath it. Compare Trustico® CaaS DV + Wildcard 🔗

For the full range of automated SSL Certificates across single site, wildcard, and multi-domain coverage, explore the service overview. Explore Certificate as a Service (CaaS) 🔗