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: 214 [Rate centres in NPA 214] [Dial plan for NPA 214]

NXX: 400

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
214-400 A Midlothian TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552      
214-400 0 Midlothian TX DLLSTX3769Z  139F WORLDCALL INTERCONNECT INC. 552   2010-12-24   
214-400 1 Midlothian TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2019-02-18   
214-400 2 Midlothian TX DLLTTXID1MD  5562 METROPCS, INC. 552   2011-07-15   
214-400 3 Midlothian TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2012-10-06   
214-400 4 Midlothian TX DLLTTXID1MD  5562 METROPCS, INC. 552   2011-03-13   
214-400 5 Midlothian TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2012-12-16   
214-400 6 Midlothian TX DLLSTXALDS4  903C ONVOY, LLC - TX 552   2012-12-16   
214-400 7 Midlothian TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2012-11-26   
214-400 8 Midlothian TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2012-11-26   
214-400 9 Midlothian TX DLLTTXID1MD  6529 T-MOBILE USA, INC. 552   2012-07-27   

Last updated: Thu, 16 Oct 2025 03:04:18 UTC

Sponsored by: VoIP.ms

Like this site? We accept donations via PayPal.