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: SNANTX39TMD

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NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
956-951 1 Laredo TX 6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 566   2025-04-14   
956-951 2 Laredo TX 6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 566   2025-04-14   
956-951 3 Laredo TX 6506 CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 566   2025-06-11   

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Last updated: Tue, 01 Sep 2026 00:40:05 UTC

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