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: 777

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-777 A Cambridge MA SOVLMAABDS2  268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128      
857-777 0 Cambridge MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-01-27   
857-777 1 Cambridge MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-01-27   
857-777 2 Cambridge MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-01-27   
857-777 3 Cambridge MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2013-01-27   
857-777 4 Cambridge MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2015-06-07   
857-777 5 Cambridge MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2012-08-03   
857-777 6 Cambridge MA   6387 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 128   2013-12-15   
857-777 7 Cambridge MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2012-04-26   
857-777 8 Cambridge MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2013-10-11   
857-777 9 Cambridge MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2013-10-11   

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.