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: WNTHMAMARP0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
617-539 A Winthrop MA 9102 VERIZON NEW ENGLAND INC. 128      
617-539 0 Winthrop MA 9102 VERIZON NEW ENGLAND INC. 128      
617-539 1 Winthrop MA 9102 VERIZON NEW ENGLAND INC. 128      
617-539 3 Winthrop MA 9102 VERIZON NEW ENGLAND INC. 128      
617-539 9 Winthrop MA 9102 VERIZON NEW ENGLAND INC. 128      
617-846 A Winthrop MA 9102 VERIZON NEW ENGLAND INC. 128      

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

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