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: 637

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
313-637 A Detroit Zone 6 MI   829J PAETEC ITEL, LLC 340      
313-637 0 Detroit Zone 6 MI   829J PAETEC ITEL, LLC 340      
313-637 1 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340      
313-637 2 Detroit Zone 6 MI   829J PAETEC ITEL, LLC 340      
313-637 3 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340      
313-637 4 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340      
313-637 5 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340      
313-637 6 Detroit Zone 6 MI SFLDMITODS2  543C ONVOY, LLCV - MI 340      
313-637 7 Detroit Zone 6 MI   829J PAETEC ITEL, LLC 340      
313-637 8 Detroit Zone 6 MI SFLDMIMNXRX  991E BANDWIDTH.COM CLEC, LLC - MI 340      
313-637 9 Detroit Zone 6 MI   829J PAETEC ITEL, LLC 340      

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

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.