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.

NPA: 857 [Rate centres in NPA 857] [Dial plan for NPA 857]

NXX: 763

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-763 A Boston MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128      
857-763 0 Boston MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2016-10-17   
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   
857-763 6 Boston MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2016-09-05   
857-763 7 Boston MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2016-09-05   
857-763 8 Boston MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2016-09-05   
857-763 9 Boston MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2016-09-05   

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.