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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NPA: 425 [Rate centres in NPA 425] [Dial plan for NPA 425]

NXX: 554

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
425-554 A Everett WA EVRTWAXAX3Y  624H ONVOY SPECTRUM, LLC 674      
425-554 0 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 1 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 2 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 3 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 4 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 5 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 6 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 7 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 8 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   
425-554 9 Everett WA   624H ONVOY SPECTRUM, LLC 674   2022-12-17   

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

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