Membership is FREE – with unlimited access to all features, tools, and discussions. Premium accounts get benefits like banner ads and newsletter exposure. ✅ Signature links are now free for all. 🚫 No AI-generated (LLM) posts allowed. Share your own thoughts and experience — accounts may be terminated for violations.
Considering the point-n-shoot nature of the platform and the intent of the backers, I would say that sub-domains aren't going to fly as well on a Portable.
It doesn't say that you can't use third-level domains (i.e., "subdomains"). In fact, it states that you should "Identify national variations of dotmobi sites by using the corresponding country code top level domain identifier (ccTLD) as the third level domain identifier." (Note: using the ccTLD like this is not mandatory but is in the list of "highly recommended best practices.")
The only restriction is that, when a website is accessed through a third-level subdomain or through just the second-level domain name, "the response must be encoded in XHTML-MP unless the device accessing it is known to support an alternative choice of markup." This is a mandatory registrant rule.