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: 557

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-557 A Boston MA CMBRMABETMD  321J HD CARRIER LLC 128      
857-557 0 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 1 Boston MA CMBRMABEEMD  116E INTRADO COMMUNICATIONS, LLC 128      
857-557 2 Boston MA CMBRMAORDS0  7199 MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MA 128      
857-557 3 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 4 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 5 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 6 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 7 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 8 Boston MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-557 9 Boston MA CMBRMABETMD  321J HD CARRIER LLC 128      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.