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.
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Switch: STTLWAWB22Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
206-638 A Seattle WA 515J IP HORIZON LLC 674      
206-638 1 Seattle WA 515J IP HORIZON LLC 674   2021-04-23   
206-707 A Seattle WA 515J IP HORIZON LLC 674      
206-743 3 Seattle WA 515J IP HORIZON LLC 674   2011-02-22   

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

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