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: 817 [Rate centres in NPA 817] [Dial plan for NPA 817]

NXX: 904

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
817-904 A Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
817-904 1 Acton TX FTWOTXEDX1Z  7148 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 552   2020-12-14   
817-904 2 Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2010-06-15   
817-904 3 Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2020-08-16   
817-904 4 Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2020-08-16   
817-904 5 Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2020-08-16   
817-904 6 Acton TX DLLRTXVM0MD  506J TWILIO INTERNATIONAL INC 552   2020-10-12   
817-904 7 Acton TX   508J CENTURYLINK COMMUNICATIONS LLC 552   2014-12-22   
817-904 8 Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2020-09-26   
817-904 9 Acton TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2020-09-26   

Last updated: Sun, 31 Oct 2021 22:15:27 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.