I'm building white-label progressive web apps and want each client to have a clean address such as veterinary1.example.com or plastic1.example.com. I'm looking for a service that rents subdomains on short, memorable domains, since buying a premium two- to four-letter domain isn't in my budget yet. The main goal is making setup simple for nontechnical clients and avoiding an agency-branded URL that feels generic.
3 Answers
The simplest and most reliable option is usually to register one domain you control and use wildcard DNS. Then every client can use something like veterinary1.yourdomain.com without creating records manually. You can also automate provisioning through your registrar or DNS provider.
Subdomain-rental services can work, but they create dependency on someone else’s domain reputation and policies. If the provider changes ownership, shuts down, or gets abused by another customer, your clients’ URLs could be affected. Owning the parent domain gives you much more control and makes it easier to migrate later.
A short domain would be nicer for client-facing use, but I’d treat a rented subdomain as temporary branding rather than something to build the business around.
You could look for a moderately short, distinctive domain instead of limiting yourself to two-letter names. A memorable four- or five-character domain, a newer extension, or a brandable word may be affordable while still looking better than a long agency URL. You can then offer each client their own subdomain and later support custom domains.

That’s what I’m doing now. I’m mainly looking for a cleaner, more memorable alternative for early direct clients before investing in a premium short domain.