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: 254

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-254 A Boston MA   829J PAETEC ITEL, LLC 128      
857-254 0 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 1 Boston MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2005-11-28   
857-254 2 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 3 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 4 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 5 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 6 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 7 Boston MA   829J PAETEC ITEL, LLC 128      
857-254 8 Boston MA CMBRMAORDSG  4018 LEVEL 3 COMMUNICATIONS, LLC - MA 128   2005-11-28   
857-254 9 Boston MA   829J PAETEC ITEL, LLC 128   2005-11-28   

Last updated: Sun, 01 Jun 2025 02:18:11 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.