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: 340

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-340 A Brookline MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128      
857-340 0 Brookline MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2020-12-06   
857-340 1 Brookline MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2020-12-06   
857-340 2 Brookline MA BSTPMALLOMD  073H TELNYX LLC 128   2021-03-04   
857-340 3 Brookline MA BSTPMALLZMD  506J TWILIO INTERNATIONAL, INC. 128   2020-12-19   
857-340 4 Brookline MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-03-12   
857-340 5 Brookline MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-03-12   
857-340 6 Brookline MA BSTPMALLDS3  892D ONVOY, LLC - MA 128   2021-03-12   
857-340 7 Brookline MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2021-02-05   
857-340 8 Brookline MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2021-02-05   
857-340 9 Brookline MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2020-11-13   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.