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: 661 [Rate centres in NPA 661] [Dial plan for NPA 661]

NXX: 238

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
661-238 A Tehachapi CA BKFDCA11EMD  981E BANDWIDTH.COM CLEC, LLC - CA 734      
661-238 0 Tehachapi CA   981E BANDWIDTH.COM CLEC, LLC - CA 734   2010-10-01   
661-238 1 Tehachapi CA   515J IP HORIZON LLC 734      
661-238 2 Tehachapi CA   515J IP HORIZON LLC 734      
661-238 3 Tehachapi CA   981E BANDWIDTH.COM CLEC, LLC - CA 734   2010-03-04   
661-238 4 Tehachapi CA   073H TELNYX LLC 734   2017-03-24   
661-238 5 Tehachapi CA   6010 NEW CINGULAR WIRELESS PCS, LLC 734   2007-07-12   
661-238 6 Tehachapi CA   6529 T-MOBILE USA, INC. 734   2010-03-03   
661-238 7 Tehachapi CA   981E BANDWIDTH.COM CLEC, LLC - CA 734   2010-10-29   
661-238 8 Tehachapi CA   6010 NEW CINGULAR WIRELESS PCS, LLC 734   2015-10-13   
661-238 9 Tehachapi CA   6529 T-MOBILE USA, INC. 734   2007-02-25   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.