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.

Switch: SNANTX91X7Y

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-857 1 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2006-02-09   
956-857 2 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2006-02-09   
956-898 A Laredo TX 4290 STPCS JOINT VENTURE, LLC 566      
956-898 0 Laredo TX 5562 METROPCS, INC. 566   2018-10-12   
956-898 4 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2012-10-16   
956-898 5 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2012-10-16   
956-898 6 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2012-10-16   
956-898 7 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2012-07-27   
956-898 8 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2012-07-27   
956-898 9 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2012-07-27   
956-949 A Laredo TX 4290 STPCS JOINT VENTURE, LLC 566      
956-949 9 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2007-09-03   
956-952 0 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2021-11-14   
956-952 9 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2021-11-14   
956-955 0 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-955 1 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-955 2 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-955 9 Laredo TX 4290 STPCS JOINT VENTURE, LLC 566   2020-09-11   
956-964 1 Encinal TX 5562 METROPCS, INC. 566   2023-01-01   
956-964 4 Encinal TX 6529 T-MOBILE USA, INC. 566   2024-11-05   
956-999 0 Laredo TX 5562 METROPCS, INC. 566   2013-07-06   
956-999 1 Laredo TX 5562 METROPCS, INC. 566   2013-07-06   
956-999 2 Laredo TX 5562 METROPCS, INC. 566   2013-07-06   
956-999 3 Laredo TX 5562 METROPCS, INC. 566   2013-07-06   
956-999 4 Laredo TX 5562 METROPCS, INC. 566   2013-07-06   

<< 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

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

Sponsored by: ISP Telecom

Like this site? We accept donations via PayPal.