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: 243

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-243 A Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-243 0 Boston MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2011-07-18   
857-243 1 Boston MA   5562 METROPCS, INC. 128   2010-06-19   
857-243 2 Boston MA   892D ONVOY, LLC - MA 128   2009-12-27   
857-243 3 Boston MA   5562 METROPCS, INC. 128   2010-06-19   
857-243 4 Boston MA   5562 METROPCS, INC. 128   2010-06-19   
857-243 5 Boston MA   5562 METROPCS, INC. 128   2010-06-19   
857-243 6 Boston MA   829J PAETEC ITEL, LLC 128   2009-12-29   
857-243 7 Boston MA   5562 METROPCS, INC. 128   2010-06-19   
857-243 8 Boston MA   316E YMAX COMMUNICATIONS CORP. - MA 128   2010-05-03   
857-243 9 Boston MA   316E YMAX COMMUNICATIONS CORP. - MA 128   2010-05-03   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.