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: 509 [Rate centres in NPA 509] [Dial plan for NPA 509]

NXX: 428

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
509-428 A Ritzville WA EWNCWA270MD  6529 T-MOBILE USA, INC. 676      
509-428 2 Ritzville WA SPKNWA01XUX  6121 LEVEL 3 COMMUNICATIONS, LLC - WA 676   2004-06-05   
509-428 4 Ritzville WA EWNCWA270MD  6529 T-MOBILE USA, INC. 676   2023-01-22   
509-428 5 Ritzville WA EWNCWA270MD  6529 T-MOBILE USA, INC. 676   2021-02-28   
509-428 7 Ritzville WA SPKNWA01XXX  483E ONVOY, LLC - WA 676   2011-08-13   
509-428 8 Ritzville WA   6529 T-MOBILE USA, INC. 676   2019-06-13   
509-428 9 Ritzville WA EWNCWA270MD  6529 T-MOBILE USA, INC. 676      

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.