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.

Isleton, CA

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
279-688 A SCRMCA0104Z  965H FRACTEL, LLC 726      
279-688 0   649C ONVOY, LLC - CA 726   2023-07-22   
279-688 2   649C ONVOY, LLC - CA 726   2022-08-27   
279-688 3   649C ONVOY, LLC - CA 726   2022-08-27   
279-688 4   649C ONVOY, LLC - CA 726   2022-10-30   
279-688 5   649C ONVOY, LLC - CA 726   2022-10-30   
279-688 6   145J TERRA NOVA TELECOM INC. 726   2025-06-10   
279-688 8   965H FRACTEL, LLC 726   2022-07-24   
916-610 A EKGVCAXGX3X  649C ONVOY, LLC - CA 726      
916-610 0   649C ONVOY, LLC - CA 726   2021-05-31   
916-610 1   649C ONVOY, LLC - CA 726   2021-06-01   
916-610 2   649C ONVOY, LLC - CA 726   2021-08-08   
916-610 3   649C ONVOY, LLC - CA 726   2021-09-09   
916-610 4   649C ONVOY, LLC - CA 726   2021-09-09   
916-610 5   649C ONVOY, LLC - CA 726   2021-09-09   
916-610 6   624H ONVOY SPECTRUM, LLC 726   2021-06-01   
916-610 7   624H ONVOY SPECTRUM, LLC 726   2021-06-01   
916-610 8   624H ONVOY SPECTRUM, LLC 726   2021-11-05   
916-610 9   649C ONVOY, LLC - CA 726   2021-10-02   
916-623 A SCRMCA01X9Z  508J CENTURYLINK COMMUNICATIONS, LLC 726      
916-623 0   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 726      
916-623 1   649C ONVOY, LLC - CA 726   2020-12-07   
916-623 2   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 726      
916-623 3   506J TWILIO INTERNATIONAL, INC. 726   2021-05-13   
916-623 4   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 726   2005-07-30   
916-623 5   981E BANDWIDTH.COM CLEC, LLC - CA 726   2009-02-25   
916-623 6   508J CENTURYLINK COMMUNICATIONS, LLC 726   2014-07-21   
916-623 7   649C ONVOY, LLC - CA 726   2020-12-07   
916-623 8   8826 LEVEL 3 COMMUNICATIONS, LLC - CA 726   2012-12-06   
916-623 9   9262 UTILITY TELECOM GROUP, LLC - CA 726   2020-03-04   
916-777 A ISTNCAXFRS2  2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 726      
916-777 0   649C ONVOY, LLC - CA 726   2021-03-04   
916-777 1   965H FRACTEL, LLC 726   2020-07-27   
916-777 2   649C ONVOY, LLC - CA 726   2010-12-17   
916-777 3   649C ONVOY, LLC - CA 726   2010-12-17   
916-777 4   2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 726      
916-777 5   2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 726      
916-777 6   2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 726      
916-777 7   2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 726      
916-777 8   965H FRACTEL, LLC 726   2020-07-27   
916-777 9   2308 CITIZENS TELECOM CA. DBA FRONTIER COM OF CA 726      

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.