There is a wide range of domain extensions, also known as top-level domains (TLDs), beyond the traditional ones like .com, .net, and .org. Some examples include .io, .app, .blog, and country-specific ones like .uk or .ca. Each extension may have specific restrictions or unique features set by the registry that manages it.

For instance, .gov is reserved for government entities, .edu for educational institutions, and some, like .aero or .museum, are restricted to specific industries. Newer generic TLDs (gTLDs) like .app may have additional security features.

It’s essential to check with domain registrars or the respective registry for each TLD to understand any restrictions or features associated with them before registering a domain.