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: 442 [Rate centres in NPA 442] [Dial plan for NPA 442]

NXX: 204

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
442-204 A Vista CA SNDGCA0242Z  516C AT&T CORP. 732      
442-204 0 Vista CA   981E BANDWIDTH.COM CLEC, LLC - CA 732   2016-07-18   
442-204 1 Vista CA   649C ONVOY, LLC - CA 732   2016-07-18   
442-204 2 Vista CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2016-07-11   
442-204 3 Vista CA   649C ONVOY, LLC - CA 732   2016-07-18   
442-204 4 Vista CA   6006 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 732   2016-06-11   
442-204 5 Vista CA   516C AT&T CORP. 732   2016-06-10   
442-204 6 Vista CA   6529 T-MOBILE USA, INC. 732   2016-08-19   
442-204 7 Vista CA   321J HD CARRIER LLC 732   2016-06-11   
442-204 8 Vista CA   321J HD CARRIER LLC 732   2016-06-11   
442-204 9 Vista CA   321J HD CARRIER LLC 732   2016-06-11   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.