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: 307

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
517-307 A Jackson MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2025-11-20   
517-307 3 Jackson MI   321J HD CARRIER LLC 346   2026-02-14   
517-307 4 Jackson MI   321J HD CARRIER LLC 346   2026-02-14   
517-307 5 Jackson MI   321J HD CARRIER LLC 346   2026-02-14   
517-307 6 Jackson MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2026-02-13   
517-307 7 Jackson MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2026-02-13   
517-307 8 Jackson MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2026-04-10   
517-307 9 Jackson MI   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 346   2025-11-20   

Last updated: Sat, 21 Mar 2026 23:53:39 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.