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.
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Martintown, ON

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
343-441 A CRNWON24FMD  383H INNSYSVOICE CORP - ON 888 805142    
343-678 A CRNWON240MD  464D FIBERNETICS CORPORATION 888 805142    
613-528 A MTTWON29RS0  8051 BELL ONTARIO 888 805142    
753-225 A   743B ROGERS COMMUNICATIONS CANADA INC. 888 805142    
753-689 A CRNWON24EMD  4727 ISP TELECOM, INC. 888 805142    

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

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