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: 779 [Rate centres in NPA 779] [Dial plan for NPA 779]

NXX: 356

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
779-356 A Crystal Lake IL CHCGILWURMD  965H FRACTEL, LLC 358      
779-356 0 Crystal Lake IL   495J STRATUS NETWORKS 358   2020-10-02   
779-356 1 Crystal Lake IL   515J IP HORIZON LLC 358   2021-06-14   
779-356 2 Crystal Lake IL   318J COMCAST IP PHONE, LLC 358   2022-05-10   
779-356 4 Crystal Lake IL   318J COMCAST IP PHONE, LLC 358   2022-05-10   
779-356 5 Crystal Lake IL   6529 T-MOBILE USA, INC. 358   2023-11-24   
779-356 6 Crystal Lake IL   6529 T-MOBILE USA, INC. 358   2023-11-24   
779-356 7 Crystal Lake IL   965H FRACTEL, LLC 358   2020-09-11   
779-356 8 Crystal Lake IL   224C ONVOY, LLC 358   2023-07-23   
779-356 9 Crystal Lake IL   965H FRACTEL, LLC 358   2020-09-11   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.