N11 code

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For other uses, see N11 (disambiguation).
A standard U.S. road sign reminding drivers and passengers about 9-1-1 service.

An N11 code ("N-one-one" code) or N11 number is a three-digit abbreviated dialing telephone number within the North American Numbering Plan (NANP) which allows access to specific local services.

Usage is generally assigned as follows:

A standard U.S. road sign reminding drivers and passengers about 5-1-1 service.

Each of these eight numbers is part of a dial plan that prevents 10,000 telephone numbers (from N11-0000 to N11-9999) from being assigned. Only non-geographic area codes, such as toll-free 800/888/877/866/855/844 numbers, area code 600 and area code 900 may use N11 as the telephone exchange prefix, since there is no local calling from these area codes. Even there, the ban against issuing 9-1-1 as an area code or exchange prefix remains absolute.


9-1-1 and 4-1-1 work from nearly every telephone in the U.S. and Canada, while the availability of the other N11 codes varies by location. 9-1-1 access is mandated by law, even on lines with no service (a "soft" dial tone). 6-1-1 (formerly 8-1-1) may also be accessible to activate service on such lines, and 3-1-1 may be available as well for urgent (but non-emergency) calls to police, or any call to local government in some places. Generally, only 4-1-1 calls incur a fee.

Other community services are provided through 2-1-1, but only if a non-profit organization such as the United Way operates it locally. Likewise, local or state/provincial government may or may not operate traffic information through 5-1-1. 8-1-1 was made mandatory in the U.S. in 2007, as is 7-1-1. Unlike 9-1-1, these may or may not be available on a phone without paid service.


0-1-1 followed by a country code is used to dial internationally, but this use is not considered an N11 code. 1-1-1 is not available in the NANP, because 11 is the prefix used to access vertical service codes from rotary phones, and is essentially meaningless to the system otherwise.

See also[edit]


  1. ^ See FCC Doc. No. 92-105

External links[edit]