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: 943

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
303-943 A Denver CO DNVRCOMA49Z  622J SKYE TELECOM LLC DBA SKYETEL 656      
303-943 0 Denver CO DNVRCOMA49Z  622J SKYE TELECOM LLC DBA SKYETEL 656      
303-943 1 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656      
303-943 2 Denver CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656      
303-943 3 Denver CO DNVRCOII4MD  5562 METROPCS, INC. 656      
303-943 4 Denver CO DNVRCOII4MD  5562 METROPCS, INC. 656      
303-943 5 Denver CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656      
303-943 6 Denver CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656      
303-943 7 Denver CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656      
303-943 8 Denver CO DNVRCOSOFMD  624H ONVOY SPECTRUM, LLC 656      
303-943 9 Denver CO DNVTCOZIDS1  026D ONVOY, LLC - CO 656      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.