Local Calling Guide

Area code/prefix search

Search area code/prefix (NPA/NXX)
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NPA: 857 [Rate centres in NPA 857] [Dial plan for NPA 857]

NXX:

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-504 A Boston MA   648G MOSAIC NETWORX LLC - MA 128      
857-504 0 Boston MA   648G MOSAIC NETWORX LLC - MA 128   2015-10-16   
857-504 1 Boston MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2015-11-07   
857-504 2 Boston MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2016-02-19   
857-504 3 Boston MA   7199 MCI WORLDCOM COMMUNICATIONS, INC. - MA 128   2015-11-10   
857-504 4 Boston MA   5562 METRO PCS, INC. 128   2016-02-13   
857-504 5 Boston MA   5562 METRO PCS, INC. 128   2016-02-13   
857-504 6 Boston MA   4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2016-02-19   
857-504 7 Boston MA   7199 MCI WORLDCOM COMMUNICATIONS, INC. - MA 128   2016-03-09   
857-504 8 Boston MA   268F PEERLESS NETWORK OF MASSACHUSETTS, LLC - MA 128   2015-12-06   
857-504 9 Boston MA   4084 PAETEC COMMUNICATIONS, INC.- MA 128   2016-02-04   

Last updated: Tue, 31 Dec 2019 02:37:20 UTC

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