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: 237

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
737-237 A Austin TX AUSTTXGR03Z  903C ONVOY, LLC - TX 558      
737-237 0 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 1 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 2 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 3 Austin TX   6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 558   2018-12-03   
737-237 4 Austin TX   6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 558   2018-12-03   
737-237 5 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 6 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 7 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 8 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   
737-237 9 Austin TX   903C ONVOY, LLC - TX 558   2018-04-06   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.