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: HRFRCT034MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
475-376 A Newtown CT 839J EON TELECOM, INC. 920   2024-11-28   
475-378 A New Canaan CT 839J EON TELECOM, INC. 920   2024-11-28   
475-379 A New Haven CT 839J EON TELECOM, INC. 920   2024-11-28   
475-380 A Danbury CT 839J EON TELECOM, INC. 920   2024-11-30   
959-270 A Bristol CT 839J EON TELECOM, INC. 920   2024-11-28   
959-272 A Clinton CT 839J EON TELECOM, INC. 920   2024-11-28   

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

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