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: 993

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-993 A Brownsville TX   515J IP HORIZON LLC 568   2025-06-01   
956-993 1 Brownsville TX   515J IP HORIZON LLC 568   2025-06-01   
956-993 2 Brownsville TX   515J IP HORIZON LLC 568   2025-06-01   

Last updated: Sun, 27 Apr 2025 12:48:38 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.