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: 557

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
631-557 A Amagansett NY NYCMNYBXDSL  384C ONVOY, LLC- NY 132      
631-557 0 Amagansett NY   384C ONVOY, LLC- NY 132   2015-12-08   
631-557 1 Amagansett NY   515J IP HORIZON LLC 132   2014-08-08   
631-557 2 Amagansett NY   997E BANDWIDTH.COM CLEC, LLC - NY 132   2016-07-15   
631-557 3 Amagansett NY   7126 CABLEVISION LIGHTPATH, INC. - NY 132   2018-08-10   
631-557 4 Amagansett NY   155E PEERLESS NETWORK OF NEW YORK, LLC - NY 132   2019-11-17   
631-557 5 Amagansett NY   384C ONVOY, LLC- NY 132   2020-06-21   
631-557 6 Amagansett NY   384C ONVOY, LLC- NY 132   2020-06-21   
631-557 7 Amagansett NY   1215 CORETEL NEW YORK, INC. - NY 132   2019-04-01   
631-557 8 Amagansett NY   073H TELNYX LLC 132   2018-11-01   
631-557 9 Amagansett NY   515J IP HORIZON LLC 132   2024-09-14   

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: FiberConX Communications Ltd.

Like this site? We accept donations via PayPal.