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: CRLBNMXAPS0

Remotes:

Switch Switch name Switch type
CBCVNMXARP0  CARLSBAD  RP 
LVNGNMXARP0  LOVING  RP 
NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
575-236 2 Carlsbad NM 1164 VALOR TELECOM TX,LP-NM #1 DBA WINDSTREAM COMM SW 664      

Last updated: Sun, 07 Dec 2025 22:02:11 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.