This page (revision-7) was last changed on 29-Nov-2024 16:16 by -jim

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North American Numbering Plan
North American Numbering Plan

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* 5XX-NXX codes are in the format 5XX-NXX-XXXX. 5XX-NXX codes, each subsuming a block of 10,000 numbers, are assigned to service providers.
* 555 line numbers have been returned to the inventory of NANPA resources. The following 555 line numbers remain in use:
** 555-1212 Directory Assistance National use
** 555-4334 Assigned National use
* N9X - The 80 codes in this format, called expansion codes, have been reserved for use during the period when the current 10-digit NANP number format undergoes expansion.
* 37X and 96X - Two blocks of 10 codes each have been set aside by the INC for unanticipated purposes where it may be important to have a full range of 10 contiguous codes available.
* 800-855 - numbers are strictly assigned for toll-free use, and the Toll-Free Numbers.
* 900 - numbers are used for premium services, with the cost of each 900 call is billed to the calling party.
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This page (revision-7) was last changed on 29-Nov-2024 16:16 by -jimTop