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.

Mansfield EMS, TX

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
817-477 A FTWOTXBRDS0  9533 SOUTHWESTERN BELL 552      
817-477 0   9533 SOUTHWESTERN BELL 552      
817-477 1   9533 SOUTHWESTERN BELL 552      
817-477 2   9533 SOUTHWESTERN BELL 552      
817-477 3   9533 SOUTHWESTERN BELL 552      
817-477 4   9533 SOUTHWESTERN BELL 552      
817-477 5   9533 SOUTHWESTERN BELL 552      
817-477 6   903C ONVOY, LLC - TX 552   2016-02-26   
817-477 7   5562 METROPCS, INC. 552   2010-02-19   
817-477 8   9533 SOUTHWESTERN BELL 552      
817-477 9   9533 SOUTHWESTERN BELL 552      

Last updated: Thu, 01 Jan 2026 03:59:49 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.