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: 434

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
551-434 A Bayonne NJ   637C ONVOY, LLC - NJ 224      
551-434 0 Bayonne NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2026-04-04   
551-434 1 Bayonne NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2026-05-31   
551-434 7 Bayonne NJ   114J EXIANT COMMUNICATIONS LLC 224   2026-11-17   

Last updated: Sat, 10 Oct 2026 15:24:20 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.