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: 346 [Rate centres in NPA 346] [Dial plan for NPA 346]

NXX: 981

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
346-981 A Houston TX   193E 8X8, INC. 560   2026-11-13   
346-981 1 Houston TX   193E 8X8, INC. 560   2026-11-13   
346-981 7 Houston TX   9558 INTRADO COMMUNICATIONS, LLC 560   2026-11-16   

Last updated: Tue, 29 Sep 2026 03:00:13 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.