One of Domainr's most important features is its ability to quickly check the status of domains you're searching for. It checks the DNS to see if your searches have any entries, and if it doesn't find any, assumes they're available for registration. This works for most domains, but some have implemented wildcard DNS—we've tried to catch as many of these as possible (like .st) and indicate this in Domainr.
Availability is entirely different than possibility though—sometimes top-level domains have their own registration restrictions. Here are some of the ones we've encountered (and indicate in the site):
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