Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 336 [Rate centres in NPA 336] [Dial plan for NPA 336]

NXX: 499

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
336-499 A Winston-Salem NC GNBONCCKX9X  3235 LEVEL 3 COMMUNICATIONS, LLC - NC 424      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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