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Telephone number mapping is a system of unifying the international telephone number system of the public switched telephone network with the Internet addressing and identification name spaces. Internationally, telephone numbers are systematically organized by the E.164 standard, while the Internet uses the Domain Name System (DNS) for linking ...
E.164 numbers may be registered in the Domain Name System (DNS) of the Internet in which the second-level domain e164.arpa has been reserved for telephone number mapping (ENUM). In the system, any telephone number may be mapped into a domain name using a reverse sequence of subdomains for each digit. For example, the telephone number +1 999 555 ...
The North American Numbering Plan (NANP) divides the territories of its members into geographic numbering plan areas (NPAs). Each NPA is identified by one or more numbering plan area codes (NPA codes, or area codes), consisting of three digits that are prefixed to each local telephone number having seven digits.
The format of the toll-free number is called a non-geographic number, in contrast to telephone numbers associated with households that are geographic. (Since the advent of cell phones and voice over IP, households can have any area code in the U.S., but it is still geographic in the sense that calls from that area code are considered local, but ...
A broad division is commonly recognized between closed and open numbering plans. A closed numbering plan, as found in North America, features fixed-length area codes and local numbers, while an open numbering plan has a variance in the length of the area code, local number, or both of a telephone number assigned to a subscriber line. The latter ...
The Glenn Miller tune PEnnsylvania 6-5000 refers to telephone number PE6-5000, a number in service at the Hotel Pennsylvania (212 736-5000) in New York City until the hotel's closing in 2020. Similarly, the movie BUtterfield 8 is set in the East Side of Manhattan between roughly 64th and 86th Streets, where the telephone prefixes include 288.