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: 377

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
551-377 A Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224      
551-377 0 Union City NJ NWRKNJMDOMD  939H COMMIO, LLC 224   2024-02-05   
551-377 1 Union City NJ NWRKNJMDOMD  939H COMMIO, LLC 224   2024-02-05   
551-377 2 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2023-11-19   
551-377 3 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2023-11-19   
551-377 4 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2024-02-19   
551-377 5 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2024-02-19   
551-377 6 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2024-02-19   
551-377 7 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2024-07-01   
551-377 8 Union City NJ NWRKNJMDOMD  939H COMMIO, LLC 224   2024-02-05   
551-377 9 Union City NJ NWRKNJMDDSK  637C ONVOY, LLC - NJ 224   2024-06-07   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.