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: 280

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-280 A Brighton MA BSTPMALLDS3  892D ONVOY, LLC - MA 128      
857-280 0 Brighton MA   892D ONVOY, LLC - MA 128   2016-04-28   
857-280 1 Brighton MA   892D ONVOY, LLC - MA 128   2016-04-28   
857-280 2 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 3 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 4 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 5 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 6 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 7 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 8 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   
857-280 9 Brighton MA   321J HD CARRIER LLC 128   2016-04-29   

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.