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: 553

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
817-553 A Euless TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
817-553 0 Euless TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2026-06-13   
817-553 1 Euless TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
817-553 2 Euless TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
817-553 4 Euless TX DLLTTX01IMD  5562 METROPCS, INC. 552   2026-07-12   
817-553 8 Euless TX DLLSTXALDS4  903C ONVOY, LLC - TX 552      
817-553 9 Euless TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2026-06-13   

Last updated: Sat, 01 Aug 2026 03:19:33 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.