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: 656 [Rate centres in NPA 656] [Dial plan for NPA 656]

NXX: 273

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
656-273 A Tampa Central FL   937C ONVOY, LLC - FL 952   2026-03-20   
656-273 0 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-03-20   
656-273 1 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-03-20   
656-273 2 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   
656-273 3 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   
656-273 4 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   
656-273 5 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   
656-273 6 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   
656-273 7 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   
656-273 8 Tampa Central FL   937C ONVOY, LLC - FL 952   2026-04-12   

Last updated: Tue, 31 Mar 2026 13:56:49 UTC

Sponsored by: Callcentric - VoIP Internet phone service

Like this site? We accept donations via PayPal.