Numbering ResourcesN11 CodesN11 codes are used to provide three-digit dialing access to special services. In the U.S., the FCC administers N11 codes. The FCC recognizes 211, 311, 511, 711, 811 and 911 as nationally assigned, but has not disturbed other traditional uses. The table below summarizes N11 assignments, reservations, and traditional usage. In some states, N11 codes that are not assigned nationally may be assigned locally, provided that these local assignments can be withdrawn promptly if a national assignment is made. There are no industry guidelines for the assignment of N11 codes.
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