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: 512

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-512 A Detroit Zone 4 MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340      
313-512 0 Detroit Zone 4 MI DTRTMIBHJMD  506J TWILIO INTERNATIONAL, INC. 340   2021-07-15   
313-512 1 Detroit Zone 4 MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2020-10-13   
313-512 2 Detroit Zone 4 MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2020-10-13   
313-512 3 Detroit Zone 4 MI SFLDMIDNDS6  6120 LEVEL 3 COMMUNICATIONS, LLC - MI 340   2020-10-13   
313-512 4 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2020-12-03   
313-512 5 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2020-12-03   
313-512 6 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2020-12-03   
313-512 7 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2020-12-03   
313-512 8 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2020-12-03   
313-512 9 Detroit Zone 4 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340   2020-12-03   

Last updated: Fri, 22 Mar 2024 03:02:44 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.