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.

Switch: HRFRCT0344Z

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
475-450 A Bridgeport CT 866H BARR TEL USA, INC. - CT 920      
475-480 A New Haven CT 866H BARR TEL USA, INC. - CT 920      
475-550 A Stamford CT 866H BARR TEL USA, INC. - CT 920      
475-750 A Danbury CT 866H BARR TEL USA, INC. - CT 920      
475-850 A Norwalk CT 866H BARR TEL USA, INC. - CT 920      
959-590 A New Britain CT 866H BARR TEL USA, INC. - CT 920      
959-885 A Enfield CT 866H BARR TEL USA, INC. - CT 920      

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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