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: SMNLOKMADS0

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
405-303 A Seminole OK 9533 SOUTHWESTERN BELL 536      
405-303 2 Seminole OK 9533 SOUTHWESTERN BELL 536      
405-303 4 Seminole OK 9533 SOUTHWESTERN BELL 536      
405-380 A Seminole OK 9533 SOUTHWESTERN BELL 536      
405-380 0 Seminole OK 9533 SOUTHWESTERN BELL 536      
405-382 A Seminole OK 9533 SOUTHWESTERN BELL 536      

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.