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: 770

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-770 A Boston MA CMBRMABEEMD  116E INTRADO COMMUNICATIONS, LLC 128      
857-770 0 Boston MA CMBRMABEEMD  116E INTRADO COMMUNICATIONS, LLC 128   2015-02-21   
857-770 1 Boston MA BSTNMABLOMD  990E BANDWIDTH.COM CLEC, LLC - MA 128   2015-05-15   
857-770 2 Boston MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2015-05-16   
857-770 3 Boston MA WSBOMAGO0MD  4084 PAETEC COMMUNICATIONS, INC. - MA 128   2015-06-18   
857-770 4 Boston MA WSBOMAGO0MD  4084 PAETEC COMMUNICATIONS, INC. - MA 128   2015-06-18   
857-770 5 Boston MA WSBOMAGO0MD  4084 PAETEC COMMUNICATIONS, INC. - MA 128   2015-06-18   
857-770 6 Boston MA WSBOMAGO0MD  4084 PAETEC COMMUNICATIONS, INC. - MA 128   2015-06-18   
857-770 7 Boston MA WSBOMAGO0MD  4084 PAETEC COMMUNICATIONS, INC. - MA 128   2015-06-18   
857-770 8 Boston MA NRTNMAAACM4  6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2015-07-23   
857-770 9 Boston MA CMBRMABEEMD  116E INTRADO COMMUNICATIONS, LLC 128   2015-02-21   

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

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.