No matter which statistics you look up, more than half of all Internet addresses have the extension .com. Also high up in the rankings are the other two generic top-level domains .net and .org. Like .com, these have been around since 1985. The other domain extensions in the top 10 are primarily country code TLDs (ccTLDs), which are country-specific. .us isn’t high up on the list at all – possibly because most websites in the USA will use .com.
Among the country code top-level domains, highly populated countries such as Russia and India are ranked up top, as are other countries with a high level of digitalization, such as the United Kingdom and Germany. Some ccTLDs can only be bought by individuals or companies residing in the respective country, and this is true of the USA. .us domains can only be registered by a US citizen, resident, or a foreign entity with a bona fide presence in the US. In short, the restrictions on this ccTLD state that there must be a US presence associated with it. This is different to other ccTLDs, such as .de (Germany). These domains are also available for foreign persons, and it may be worth registering for one if your business has a presence in Germany, for example. This is also true of other countries, but make sure you check the restrictions of registering ccTLDs beforehand.