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: 956 [Rate centres in NPA 956] [Dial plan for NPA 956]

NXX: 531

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-531 A Laredo TX SNANTXEW0MD  829J PAETEC ITEL, LLC 566   2025-01-23   
956-531 0 Laredo TX   4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-531 1 Laredo TX   4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-531 2 Laredo TX   903C ONVOY, LLC - TX 566   2020-08-13   
956-531 3 Laredo TX   903C ONVOY, LLC - TX 566   2020-08-13   
956-531 4 Laredo TX   903C ONVOY, LLC - TX 566   2020-08-13   
956-531 5 Laredo TX   829J PAETEC ITEL, LLC 566   2020-06-04   
956-531 6 Laredo TX   7138 TELEPORT COMMUNICATIONS AMERICA, LLC - TX 566   2020-08-10   
956-531 7 Laredo TX   4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-531 8 Laredo TX   4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-531 9 Laredo TX   4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.