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: 579 [Rate centres in NPA 579] [Dial plan for NPA 579]

NXX: 277

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
579-277 A Sainte-Thérèse QC STTRPQ383MD  160G COMWAVE NETWORKS INC. - ON 888 805007    

Last updated: Thu, 05 Feb 2026 23:41:55 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.