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

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