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: AMRLTXDRX4X

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
806-277 1 Clarendon TX 145J TERRA NOVA TELECOM INC. 546   2026-04-30   
806-386 2 Hereford TX 145J TERRA NOVA TELECOM INC. 546   2026-06-06   
806-484 A Amarillo TX 145J TERRA NOVA TELECOM INC. 546      
806-622 5 Amarillo TX 145J TERRA NOVA TELECOM INC. 546   2026-07-05   
806-884 5 Dalhart TX 145J TERRA NOVA TELECOM INC. 546   2026-05-01   

Last updated: Thu, 16 Jul 2026 02:21:55 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.