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: 517 [Rate centres in NPA 517] [Dial plan for NPA 517]

NXX: 733

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
517-733 A Addison MI LNNGMIDCDMD  516J TON80 COMMUNICATIONS, LLC 346      
517-733 0 Addison MI LNNGMIMN00Z  624H ONVOY SPECTRUM, LLC 346   2024-04-21   
517-733 3 Addison MI LNNGMIDCDMD  516J TON80 COMMUNICATIONS, LLC 346   2022-04-23   
517-733 7 Addison MI   145J TERRA NOVA TELECOM INC. 346   2025-07-10   

Last updated: Wed, 18 Jun 2025 02:30:00 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.