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.
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Switch: CMBRMABE5MD

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
857-346 1 Boston MA 551G NUSO, LLC 128   2018-07-22   
857-347 2 Boston MA 551G NUSO, LLC 128   2018-10-14   
857-348 2 Boston MA 551G NUSO, LLC 128   2018-10-14   
857-409 4 Boston MA 551G NUSO, LLC 128   2017-08-12   
857-409 5 Boston MA 551G NUSO, LLC 128   2017-08-12   
857-702 A Boston MA 551G NUSO, LLC 128      
857-702 1 Boston MA 551G NUSO, LLC 128   2014-04-11   
857-763 1 Boston MA 551G NUSO, LLC 128   2016-09-08   
857-763 2 Boston MA 551G NUSO, LLC 128   2016-09-08   
857-763 3 Boston MA 551G NUSO, LLC 128   2016-09-08   
857-763 4 Boston MA 551G NUSO, LLC 128   2016-09-08   
857-763 5 Boston MA 551G NUSO, LLC 128   2016-09-08   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

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