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: 281 [Rate centres in NPA 281] [Dial plan for NPA 281]

NXX: 721

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
281-721 A Houston Suburban TX HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-721 0 Houston Suburban TX HSTNTXYADS5  903C ONVOY, LLC - TX 560      
281-721 1 Houston Suburban TX HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-721 2 Houston Suburban TX HSTNTXMOX7X  318J COMCAST IP PHONE, LLC 560      
281-721 3 Houston Suburban TX HSTNTX01G04  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 560      
281-721 4 Houston Suburban TX HSTQTX02EMD  197D VONAGE AMERICA LLC 560      
281-721 5 Houston Suburban TX   903C ONVOY, LLC - TX 560      
281-721 6 Houston Suburban TX HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-721 7 Houston Suburban TX HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-721 8 Houston Suburban TX HSTNTXBUDS0  9533 SOUTHWESTERN BELL 560      
281-721 9 Houston Suburban TX HSTNTXGI0MD  004F BANDWIDTH.COM CLEC, LLC - TX 560      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.