North American Numbering Plan (NANP)

The North American Numbering Plan (NANP) is a telephone numbering system used in the United States, Canada, and several Caribbean countries. It simplifies dialing by assigning a unique 10-digit phone number to each subscriber, composed of a three-digit area code followed by a seven-digit local number. This system helps manage phone numbers, ensuring that calls are routed correctly. Introduced in 1947, it standardizes phone numbering across regions, making communication easier and more efficient for millions of users in North America.