Numbering Resources
Listed below are numbering resources administered by NANPA. Click on the appropriate link for more information about current assignments and how to obtain an assignment.
NPA (Area) Codes
Central Office Codes
N11 Codes
Carrier Identification Codes
5XX-NXX Codes
900-NXX Codes
456-NXX Codes
555 Line Numbers
ANI II Digits
Vertical Service Codes
800-855 Line Numbers
|