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: 956 [Rate centres in NPA 956] [Dial plan for NPA 956]

NXX: 539

NPA-NXX BLOCK Rate Centre Region Switch OCN LATA LIR Eff date Disc date
956-539 A Laredo TX SNANTXDIX4X  197D VONAGE AMERICA LLC 566      
956-539 0 Laredo TX   197D VONAGE AMERICA LLC 566   2018-12-30   
956-539 1 Laredo TX   197D VONAGE AMERICA LLC 566   2018-12-30   
956-539 2 Laredo TX   903C ONVOY, LLC - TX 566   2018-12-31   
956-539 3 Laredo TX   903C ONVOY, LLC - TX 566   2018-12-31   
956-539 4 Laredo TX   903C ONVOY, LLC - TX 566   2018-12-31   
956-539 5 Laredo TX   903C ONVOY, LLC - TX 566   2018-12-31   
956-539 6 Laredo TX   903C ONVOY, LLC - TX 566   2018-12-31   
956-539 7 Laredo TX   177F PEERLESS NETWORK OF TEXAS, LLC - TX 566   2018-12-31   
956-539 8 Laredo TX   073H TELNYX LLC 566   2019-01-07   
956-539 9 Laredo TX   4290 STPCS JOINT VENTURE, LLC 566   2019-02-03   

Last updated: Tue, 13 Jan 2026 21:50:02 UTC

Sponsored by: BeeVox - Whitelabel Reseller Platform

Like this site? We accept donations via PayPal.