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: 336 [Rate centres in NPA 336] [Dial plan for NPA 336]

NXX: 304

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
336-304 A Boomer NC NWBONC021MD  792K CHARTER IP ENABLED SERVICES, LLC 424   2025-02-05   
336-304 0 Boomer NC   792K CHARTER IP ENABLED SERVICES, LLC 424   2018-03-30   
336-304 5 Boomer NC   3235 LEVEL 3 COMMUNICATIONS, LLC - NC 424   2024-09-04   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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