It will quickly and easily give you:

• US area codes for all 50 states and territories. This includes a description of the general location of the area code and the time zone of the area code.
• A list of approximately 1500 international cities and countries with their local time, country dialing code and city dialing codes.
• A list of Internet suffixes, including top-level domain suffixes for countries and the standard .com, .gov, .mil, etc.