Most extensions are available to anyone – in fact, even most country code Top Level Domains (ccTLDs) are available for anyone to purchase, even if they don’t reside in the country in question. However, there are some domain extensions that have restrictions. For example, .gov, .edu, and .mil can only be registered if you meet certain criteria or have authorization.
In regards to the cost of the domain registration included in our services, some domain extensions are at a price point where additional fees are required. This does not apply to the majority of our clients because they tend to select .com, .net, .org, and .info domain extensions.