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: CHLSMACHDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
617-634 A East Boston MA 9102 VERIZON NEW ENGLAND INC. 128      
617-660 A Chelsea MA 9102 VERIZON NEW ENGLAND INC. 128      
617-884 A Chelsea MA 9102 VERIZON NEW ENGLAND INC. 128      
617-887 A Chelsea MA 9102 VERIZON NEW ENGLAND INC. 128      
617-889 A Chelsea MA 9102 VERIZON NEW ENGLAND INC. 128      
857-323 A Chelsea MA 9102 VERIZON NEW ENGLAND INC. 128      
857-386 A Chelsea MA 9102 VERIZON NEW ENGLAND INC. 128      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.