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: 631 [Rate centres in NPA 631] [Dial plan for NPA 631]

NXX: 387

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
631-387 A Commack NY HNTNNYSUDS2  7140 TC SYSTEMS, INC. - NY 132      
631-387 0 Commack NY   7140 TC SYSTEMS, INC. - NY 132      
631-387 1 Commack NY   5562 METROPCS, INC. 132   2003-09-20   
631-387 2 Commack NY   5562 METROPCS, INC. 132   2003-09-20   
631-387 3 Commack NY   5562 METROPCS, INC. 132   2004-07-12   
631-387 4 Commack NY   384C ONVOY, LLC- NY 132   2013-01-17   
631-387 5 Commack NY   5562 METROPCS, INC. 132   2004-10-18   
631-387 6 Commack NY   5562 METROPCS, INC. 132   2004-12-24   
631-387 7 Commack NY   145J TERRA NOVA TELECOM INC. 132   2022-05-05   
631-387 8 Commack NY   7421 AT&T - LOCAL 132   2001-11-19   

Last updated: Thu, 29 Jan 2026 14:35:03 UTC

Sponsored by: Execulink Telecom

Like this site? We accept donations via PayPal.