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NPA Codes (Area Codes) >>

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CNA Administered

600 NXX Service Access Code >>

600 NXX Description

600 NXX Assignment Guideline

CO (Central Office) Codes and Thousands Blocks>>

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TBP Implementation Page

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Non-CNA/Sunset >>

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456 NXX International Inbound Codes (Sunset)

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NPA Relief

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Relief Planning >>

226/519/548 (Southwestern Ontario)

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506 (New Brunswick)

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NRUF

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