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: 334 [Rate centres in NPA 334] [Dial plan for NPA 334]

NXX: 600

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
334-600 A Holtville AL MTGMALMT47Z  5562 METROPCS, INC. 478      
334-600 0 Holtville AL   5562 METROPCS, INC. 478   2015-02-20   
334-600 1 Holtville AL   604E ONVOY, LLC - AL 478   2016-03-14   
334-600 2 Holtville AL   604E ONVOY, LLC - AL 478   2016-03-14   
334-600 3 Holtville AL   5562 METROPCS, INC. 478   2015-02-23   
334-600 4 Holtville AL   072F BANDWIDTH.COM CLEC, LLC - AL 478   2016-07-18   
334-600 5 Holtville AL   604E ONVOY, LLC - AL 478   2017-06-01   
334-600 6 Holtville AL   145J TERRA NOVA TELECOM INC. 478   2025-07-31   
334-600 7 Holtville AL   604E ONVOY, LLC - AL 478   2017-06-01   
334-600 8 Holtville AL   604E ONVOY, LLC - AL 478   2020-09-25   
334-600 9 Holtville AL   5562 METROPCS, INC. 478   2015-02-20   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.