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: 303 [Rate centres in NPA 303] [Dial plan for NPA 303]

NXX: 351

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-351 A Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
303-351 0 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2009-12-17   
303-351 1 Deckers CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2008-11-20   
303-351 2 Deckers CO DNVRCOMAXGZ  078F BANDWIDTH.COM CLEC, LLC - CO 656   2010-02-19   
303-351 3 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2009-02-09   
303-351 4 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2009-02-09   
303-351 5 Deckers CO DNVTCO56DS8  6118 LEVEL 3 COMMUNICATIONS, LLC - CO 656   2008-05-19   
303-351 6 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2009-06-25   
303-351 7 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2007-01-04   
303-351 8 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2008-08-21   
303-351 9 Deckers CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656   2008-12-15   

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

Sponsored by: LES.NET

Like this site? We accept donations via PayPal.