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: 737 [Rate centres in NPA 737] [Dial plan for NPA 737]

NXX: 433

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-433 A Bastrop TX   6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558      
737-433 0 Bastrop TX AUSUTXNIGT3  6534 NEW CINGULAR WIRELESS PCS, LLC - IL 558   2026-03-21   
737-433 3 Bastrop TX   114J EXIANT COMMUNICATIONS LLC 558   2026-08-31   
737-433 6 Bastrop TX   883K AHOI LLC 558   2026-04-25   
737-433 7 Bastrop TX   824J OPENTACT INC. 558   2026-09-19   

Last updated: Tue, 01 Sep 2026 00:40:05 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.