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: 325 [Rate centres in NPA 325] [Dial plan for NPA 325]

NXX: 299

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
325-299 A Stamford TX ABLNTXORXRX  624H ONVOY SPECTRUM, LLC 550      
325-299 0 Stamford TX ABLNTXORXRX  624H ONVOY SPECTRUM, LLC 550   2022-01-12   
325-299 1 Stamford TX ABLNTXORXPX  073H TELNYX LLC 550   2022-05-07   
325-299 9 Stamford TX   883K AHOI LLC 550   2026-04-26   

Last updated: Sun, 17 May 2026 03:26:51 UTC

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.