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: CHCGILWBXSZ

NPA-NXX BLOCK Rate Centre Region OCN LATA LIR Eff date Disc date
219-338 3 Cedar Lake IN 478J NUSO, LLC 358   2023-12-29   
219-338 4 Cedar Lake IN 478J NUSO, LLC 358   2023-12-29   
219-587 0 Cedar Lake IN 478J NUSO, LLC 358   2020-10-11   
262-222 9 North Antioch WI 478J NUSO, LLC 358   2024-01-01   
262-272 A North Antioch WI 478J NUSO, LLC 358      
262-272 1 North Antioch WI 478J NUSO, LLC 358   2020-10-27   
262-272 8 North Antioch WI 478J NUSO, LLC 358   2024-06-22   
262-435 1 North Antioch WI 478J NUSO, LLC 358   2024-01-01   
312-682 A Chicago Zone 01-Calumet IL 478J NUSO, LLC 358      
312-682 1 Chicago Zone 01-Calumet IL 478J NUSO, LLC 358   2020-07-16   
312-682 6 Chicago Zone 01-Calumet IL 478J NUSO, LLC 358   2020-08-07   
312-682 7 Chicago Zone 01-Calumet IL 478J NUSO, LLC 358   2020-08-07   
312-931 4 Chicago Zone 01-Franklin IL 478J NUSO, LLC 358   2024-07-10   
331-271 8 Hinsdale IL 478J NUSO, LLC 358   2020-12-20   
331-271 9 Hinsdale IL 478J NUSO, LLC 358   2020-12-20   
331-289 1 Hinsdale IL 478J NUSO, LLC 358   2023-12-14   
331-317 5 Hinsdale IL 478J NUSO, LLC 358   2024-06-04   
331-317 6 Hinsdale IL 478J NUSO, LLC 358   2024-06-04   
872-275 5 Chicago Zone 01-Calumet IL 478J NUSO, LLC 358   2023-12-03   
872-364 2 Chicago Zone 01-Calumet IL 478J NUSO, LLC 358   2024-06-14   

Last updated: Sun, 26 Jan 2025 15:59:20 UTC

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