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.

Switch: SNBNTXSBDS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-276 A San Benito TX 9533 SOUTHWESTERN BELL 568      
956-276 0 San Benito TX 9533 SOUTHWESTERN BELL 568      
956-276 2 San Benito TX 9533 SOUTHWESTERN BELL 568      
956-276 5 San Benito TX 9533 SOUTHWESTERN BELL 568      
956-276 9 San Benito TX 9533 SOUTHWESTERN BELL 568      
956-361 A San Benito TX 9533 SOUTHWESTERN BELL 568      
956-399 A San Benito TX 9533 SOUTHWESTERN BELL 568      

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.