Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
  • Effective date searches are available only for US area codes. Our sources for non-US NPA-NXX data do not provide this information.
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NPA: 856 [Rate centres in NPA 856] [Dial plan for NPA 856]

NXX: 664

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
856-664 A Glassboro NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2026-02-01   
856-664 0 Glassboro NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2026-02-01   
856-664 1 Glassboro NJ CMDNNJCEX8Z  637C ONVOY, LLC - NJ 222   2026-05-31   
856-664 8 Glassboro NJ   637C ONVOY, LLC - NJ 222   2026-08-23   
856-664 9 Glassboro NJ   637C ONVOY, LLC - NJ 222   2026-08-23   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

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