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: 551 [Rate centres in NPA 551] [Dial plan for NPA 551]

NXX: 433

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
551-433 A Hackensack NJ   700J WAVENATION, LLC 224   2026-01-31   
551-433 0 Hackensack NJ   700J WAVENATION, LLC 224   2026-01-31   
551-433 1 Hackensack NJ   637C ONVOY, LLC - NJ 224   2026-02-02   
551-433 2 Hackensack NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 224   2026-06-06   
551-433 3 Hackensack NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 224   2026-06-06   
551-433 4 Hackensack NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 224   2026-06-06   
551-433 5 Hackensack NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 224   2026-06-06   
551-433 6 Hackensack NJ   883K AHOI LLC 224   2026-05-23   
551-433 7 Hackensack NJ   4036 NEW CINGULAR WIRELESS PCS, LLC - DC 224   2026-06-06   
551-433 8 Hackensack NJ   637C ONVOY, LLC - NJ 224   2026-03-15   
551-433 9 Hackensack NJ   637C ONVOY, LLC - NJ 224   2026-05-31   

Last updated: Sun, 17 May 2026 03:26:51 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.