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: 321 [Rate centres in NPA 321] [Dial plan for NPA 321]

NXX: 523

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
321-523 A Eau Gallie FL   937C ONVOY, LLC - FL 45806   2025-11-15   
321-523 0 Eau Gallie FL   937C ONVOY, LLC - FL 45806   2025-11-15   
321-523 1 Eau Gallie FL   937C ONVOY, LLC - FL 45806   2025-11-15   
321-523 6 Eau Gallie FL   8300 TELEPORT COMMUNICATIONS AMERICA, LLC - FL 45806   2025-11-17   
321-523 8 Eau Gallie FL   937C ONVOY, LLC - FL 45806   2025-11-17   
321-523 9 Eau Gallie FL   937C ONVOY, LLC - FL 45806   2026-01-11   

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

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.