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: 720

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
817-720 A Fort Worth TX DLLSTX978MD  8413 ALLEGIANCE TELECOM, INC. - TX 552      
817-720 0 Fort Worth TX   8413 ALLEGIANCE TELECOM, INC. - TX 552      
817-720 1 Fort Worth TX   7229 MCIMETRO ACCESS TRANSMISSION SERVICES LLC 552      
817-720 2 Fort Worth TX   8413 ALLEGIANCE TELECOM, INC. - TX 552      
817-720 3 Fort Worth TX   353D CHARTER FIBERLINK TX-CCO, LLC - TX 552   2017-08-06   
817-720 4 Fort Worth TX   8413 ALLEGIANCE TELECOM, INC. - TX 552      
817-720 5 Fort Worth TX   353D CHARTER FIBERLINK TX-CCO, LLC - TX 552   2017-07-05   
817-720 6 Fort Worth TX   353D CHARTER FIBERLINK TX-CCO, LLC - TX 552   2017-05-05   
817-720 7 Fort Worth TX   353D CHARTER FIBERLINK TX-CCO, LLC - TX 552   2017-07-02   
817-720 8 Fort Worth TX   5562 METRO PCS, INC. 552   2019-07-22   
817-720 9 Fort Worth TX   177F PEERLESS NETWORK OF TEXAS, LLC - TX 552   2017-08-10   

Last updated: Sun, 04 Apr 2021 19:28:27 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.