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: 244

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-244 A Boston MA BSTNMABLOMD  990E BANDWIDTH.COM CLEC, LLC - MA 128      
857-244 0 Boston MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2008-08-15   
857-244 1 Boston MA   990E BANDWIDTH.COM CLEC, LLC - MA 128   2008-12-07   
857-244 2 Boston MA   829J PAETEC ITEL, LLC 128   2009-01-05   
857-244 3 Boston MA   5562 METROPCS, INC. 128   2009-07-20   
857-244 4 Boston MA   5562 METROPCS, INC. 128   2009-07-20   
857-244 5 Boston MA   5562 METROPCS, INC. 128   2009-07-06   
857-244 6 Boston MA   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 128   2009-05-15   
857-244 7 Boston MA   624H ONVOY SPECTRUM, LLC 128   2024-09-11   
857-244 8 Boston MA   6889 OMNIPOINT MIAMI E LICENSE, LLC 128   2025-02-06   
857-244 9 Boston MA   5562 METROPCS, INC. 128   2009-07-06   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.