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: CHSHCT02DS1

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
860-457 A Plainfield CT 7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
959-230 A Hartford CT 7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
959-242 A Norwich CT 7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      
959-299 A Hartford CT 7143 TELEPORT COMMUNICATIONS AMERICA, LLC - CT 920      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.