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

NXX: 574

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
425-574 A Bellevue WA   6529 T-MOBILE USA, INC. 674   2025-11-15   
425-574 0 Bellevue WA   6010 NEW CINGULAR WIRELESS PCS, LLC 674   2025-11-17   
425-574 1 Bellevue WA   6010 NEW CINGULAR WIRELESS PCS, LLC 674   2025-11-17   
425-574 8 Bellevue WA   6529 T-MOBILE USA, INC. 674   2025-11-15   
425-574 9 Bellevue WA   6529 T-MOBILE USA, INC. 674   2025-11-15   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.