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: 430 [Rate centres in NPA 430] [Dial plan for NPA 430]

NXX: 370

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
430-370 A Gary TX LGVWTXPLXEX  903C ONVOY, LLC - TX 554      
430-370 0 Gary TX LGVWTXPLXEX  903C ONVOY, LLC - TX 554   2023-09-18   
430-370 1 Gary TX   793K TWC IP ENABLED SERVICES, LLC 554   2025-06-29   
430-370 3 Gary TX LGVWTXPLXEX  903C ONVOY, LLC - TX 554   2023-02-13   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.