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: 313 [Rate centres in NPA 313] [Dial plan for NPA 313]

NXX: 666

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-666 A Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-666 0 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2016-02-24   
313-666 1 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2016-02-24   
313-666 2 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2016-04-28   
313-666 3 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2016-04-28   
313-666 4 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2017-12-09   
313-666 5 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2017-12-09   
313-666 6 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2015-11-16   
313-666 7 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2017-12-09   
313-666 8 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2017-12-09   
313-666 9 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340   2019-01-11   

Last updated: Tue, 16 Apr 2024 01:38:01 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.