N11 code

An N11 code (said as N-one-one) is a special short telephone number within the North American Numbering Plan, which allows access to special services. Each of these eight numbers (111 and 011 mean other things, if anything at all) prevents 10,000 telephone numbers from being used. Only non-geographic area codes such as toll-free 800/888/877/866/855 numbers, and 900 numbers may use N11 as the telephone exchange, since the area code must always be dialed for these numbers.