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.

Markham, TX

NPA-NXX BLOCK Switch OCN LATA LIR Eff date Disc date
979-843 A MRHMTXXADS0  2076 GANADO TEL. CO., INC. 560      
979-989 A HSTQTXRG6MD  139F WORLDCALL INTERCONNECT INC. 560      
979-989 6 HSTNTXJAXGY  516J TON80 COMMUNICATIONS, LLC 560      
979-989 9 HSTQTXRG6MD  139F WORLDCALL INTERCONNECT INC. 560      

Last updated: Wed, 20 Nov 2024 21:20:06 UTC

Sponsored by: VoIP Much Phone Company

Like this site? We accept donations via PayPal.