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: 947 [Rate centres in NPA 947] [Dial plan for NPA 947]

NXX: 237

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
947-237 A Birmingham MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340      
947-237 0 Birmingham MI DTRTMIVWDMD  624H ONVOY SPECTRUM, LLC 340   2022-03-06   
947-237 1 Birmingham MI SFLDMIMK3MD  197D VONAGE AMERICA LLC 340   2021-05-29   
947-237 2 Birmingham MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2021-01-07   
947-237 3 Birmingham MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-01-08   
947-237 4 Birmingham MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-01-08   
947-237 5 Birmingham MI SFLDMIMK5MD  939H COMMIO, LLC 340   2021-10-11   
947-237 6 Birmingham MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-01-08   
947-237 7 Birmingham MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-01-08   
947-237 8 Birmingham MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2021-01-08   
947-237 9 Birmingham MI SFLDMIMKDS2  933G PEERLESS NETWORK OF MICHIGAN, LLC - MI 340   2021-01-08   

Last updated: Tue, 15 Jul 2025 18:46:49 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.