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: CMBRMABEEMD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
617-865 7 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2019-11-22   
857-356 0 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2019-11-26   
857-356 1 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2019-11-26   
857-356 2 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2019-11-26   
857-557 1 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2019-11-22   
857-770 A Boston MA 116E INTRADO COMMUNICATIONS, LLC 128      
857-770 0 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2015-02-21   
857-770 9 Boston MA 116E INTRADO COMMUNICATIONS, LLC 128   2015-02-21   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

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