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: 972 [Rate centres in NPA 972] [Dial plan for NPA 972]

NXX: 688

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
972-688 A Plano TX DLLSTX97XCX  321J HD CARRIER LLC 552      
972-688 0 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 1 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 2 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 3 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 4 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 5 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 6 Plano TX IRNGTXXBXTY  903C ONVOY, LLC - TX 552   2022-01-14   
972-688 7 Plano TX IRNGTXXBXQY  624H ONVOY SPECTRUM, LLC 552   2022-01-22   
972-688 8 Plano TX DLLSTX97XCX  321J HD CARRIER LLC 552   2021-12-26   
972-688 9 Plano TX DLLSTX97XCX  321J HD CARRIER LLC 552   2021-12-26   

Last updated: Sat, 05 Apr 2025 03:03:23 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.