Reading Internet addresses is something of an art. Here are the four most important top-level functional Internet domains followed by a selection of geographical domains:
com commercial organizations edu educational institutions gov U.S. government civilian sites mil U.S. military sites
Note that most of the sites in the com and edu domains are in the U.S. or Canada.
us sites in the U.S. outside the functional domains su sites in the ex-Soviet Union (see kremvax). uk sites in the United Kingdom se sites in Sweden
Within the us domain, there are subdomains for the fifty states, each generally with a name identical to the state's postal abbreviation. Within the uk domain, there is an ac subdomain for academic sites and a co domain for commercial ones. Other top-level domains may be divided up in similar ways.