North American Numbering Plan
（重定向自NPA code）
![Countries participating in NANP](/Images/godic/202501/30/NANP_countries.svg0444.png")
![Letters of the alphabet are mapped to the digits of the telephone dial pad.](/Images/godic/202501/30/Telephone_keys0444.JPG")
.svg0444.png")
The North American Numbering Plan (NANP) is a telephone numbering plan that encompasses 25 distinct regions in twenty countries primarily in North America, including the Caribbean and the U.S. territories. Not all North American countries participate in the NANP. Each participating country forms a regulatory authority that has plenary control over local numbering resources.