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: 728

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
817-728 A Mansfield TX DLLSTXHW6MD  671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 552      
817-728 1 Mansfield TX DLLSTX97X6X  145J TERRA NOVA TELECOM INC. 552   2024-12-30   
817-728 2 Mansfield TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 552      
817-728 3 Mansfield TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 552      
817-728 5 Mansfield TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 552      
817-728 7 Mansfield TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 552      
817-728 8 Mansfield TX   671J U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS 552      

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.