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: 850 [Rate centres in NPA 850] [Dial plan for NPA 850]

NXX: 821

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
850-821 A Cantonment FL PNSCFLWAXFY  937C ONVOY, LLC - FL 44813      
850-821 0 Cantonment FL   937C ONVOY, LLC - FL 44813   2020-10-05   
850-821 1 Cantonment FL   937C ONVOY, LLC - FL 44813   2021-02-20   
850-821 2 Cantonment FL   937C ONVOY, LLC - FL 44813   2019-10-11   
850-821 3 Cantonment FL   937C ONVOY, LLC - FL 44813   2020-02-06   
850-821 4 Cantonment FL   515J IP HORIZON LLC 44813   2025-06-06   
850-821 5 Cantonment FL   624H ONVOY SPECTRUM, LLC 44813   2021-07-31   
850-821 6 Cantonment FL   937C ONVOY, LLC - FL 44813   2021-07-03   
850-821 7 Cantonment FL   937C ONVOY, LLC - FL 44813   2019-08-04   
850-821 8 Cantonment FL   937C ONVOY, LLC - FL 44813   2019-08-04   
850-821 9 Cantonment FL   515J IP HORIZON LLC 44813   2021-05-13   

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.