CUSTOM DOMAIN
Glossary
Custom domains as a service (CDaaS)
The managed infrastructure category for offering customer domains in your SaaS, and how it compares to building the stack yourself.
Custom domains as a service (CDaaS) is managed infrastructure that lets a SaaS platform's customers connect their own domains to the product. The provider handles DNS configuration, ownership verification, TLS certificate issuance and renewal, and ongoing monitoring, so the platform ships white label domains without building or operating that infrastructure itself.
The problem the category solves
Every multi-tenant product eventually hears the same request: customers want the product on their own domain. A storefront on shop.acme.com instead of acme.yourplatform.com. The request sounds small. The infrastructure behind it is not. You need DNS configuration that works across dozens of providers, each with its own console and API. You need to verify that the person connecting acme.com actually controls it. You need a TLS certificate for every connected hostname, renewed forever. You need a routing layer that maps each domain to the right tenant without letting tenants interfere with each other. And you need monitoring, because customers edit their DNS and break things without telling you.
Custom domains as a service packages that entire stack as a managed product. Your team integrates once, through a REST API, an embeddable widget, or both, and the CDaaS provider operates everything behind it. For the broader product context, see custom domains for SaaS.
What a CDaaS provider operates
- DNS automation. Detecting the customer's DNS provider and configuring records through one-click provider authorization, an API token, or a guided manual flow that verifies automatically.
- Ownership verification. Confirming the customer controls the domain before any traffic is served on it.
- TLS lifecycle. Issuing a certificate for each connected hostname and renewing it without customer action. See multi-tenant TLS for how this works at scale.
- Edge routing. A reverse proxy that terminates TLS and routes each domain to the correct tenant, with strict isolation between tenants.
- Monitoring. Watching for DNS drift, changed records, and certificate problems, with webhooks so your product can react.
CDaaS versus building in house
| Dimension | Building in house | CDaaS |
|---|---|---|
| Time to first customer domain | Weeks to months of engineering | Hours to integrate an API or widget |
| DNS provider coverage | Grows one integration at a time | Broad from day one, 63 providers on Custom Domain |
| TLS at scale | Your team owns issuance, renewal, and rate limits | Managed issuance and renewal per hostname |
| Edge operations | You run and get paged for the proxy fleet | Operated by the provider |
| Ongoing cost | Engineering time plus infrastructure | Predictable tiers, free tiers exist |
Building in house is a defensible choice when domain infrastructure is the product itself, or when policy requires every request to stay on systems you control. For most platforms, custom domains are a feature customers expect rather than the business itself, and the maintenance load of certificate renewals, DNS support tickets, and provider API changes lands on engineers who were hired to build the actual product.
When CDaaS makes sense
Site builders, ecommerce platforms, creator tools, and agencies running white label products all hit the same wall: the feature is table stakes, but the infrastructure is a distraction. A CDaaS layer turns it into an integration task. On Custom Domain, a customer's domain is typically live in about 30 seconds after they connect it, with verification and TLS handled automatically. See how it works for the flow end to end.
Frequently asked questions
Is CDaaS the same as a DNS hosting service?
No. A DNS host serves records for zones it manages. A CDaaS provider orchestrates records across whatever DNS host each customer already uses, verifies ownership, issues TLS certificates, and routes traffic to your platform. Customers keep their existing registrar and DNS setup.
Does CDaaS require my customers to transfer their domains?
No. Customers keep their domains exactly where they are. They authorize their provider in one click, paste an API token, or follow a short guided flow, and the service configures the records needed to point the domain at your platform.
What should I evaluate when choosing a CDaaS provider?
Look at DNS provider coverage, how ownership verification works, whether TLS issuance and renewal are fully automatic, tenant isolation at the edge, monitoring and webhooks, the quality of the API and embeddable widget, and whether pricing stays predictable as domain counts grow.