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: 577

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
857-577 A Charlestown MA   892D ONVOY, LLC - MA 128      
857-577 0 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 1 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 2 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 3 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 4 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 5 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 6 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   
857-577 7 Charlestown MA   892D ONVOY, LLC - MA 128   2016-04-11   
857-577 8 Charlestown MA   892D ONVOY, LLC - MA 128   2016-04-11   
857-577 9 Charlestown MA   756G WIDE VOICE, LLC - MA 128   2016-04-12   

Last updated: Sat, 31 Oct 2020 19:28:10 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.