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.
  • If you want to search an entire area code regardless of activity, leave both the next and past days fields set to zero.

NPA: 743 [Rate centres in NPA 743] [Dial plan for NPA 743]

NXX: 343

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
743-343 A Lewisville NC GNBONCEU78Z  624H ONVOY SPECTRUM, LLC 424   2024-11-03   
743-343 0 Lewisville NC GNBONCEU24Z  638E ONVOY, LLC - NC 424   2025-01-05   
743-343 3 Lewisville NC GNBONCEU78Z  624H ONVOY SPECTRUM, LLC 424   2024-11-03   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.