NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 406
T-MOBILE USA, INC. 7
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 2
NEW CINGULAR WIRELESS PCS, LLC 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2023-09-11 406-729-3XXX 3000–3999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 WILSALL MT
2023-09-11 406-804-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GARDINER MT
2023-09-06 406-491-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BUTTE MT
2023-09-06 406-929-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNGRYHORS MT
2023-09-06 406-929-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HUNGRYHORS MT
2023-08-31 406-503-4XXX 4000–4999Assigned METROPCS, INC. 5562 BILLINGS MT
2023-08-31 406-849-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 ELMO MT
2023-08-30 406-437-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F HELENA MT
2023-08-30 406-481-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2023-08-30 406-481-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2023-08-15 406-410-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2023-08-15 406-884-1XXX 1000–1999Assigned METROPCS, INC. 5562 POLSON MT
2023-08-10 406-621-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 FORTBENTON MT
2023-08-09 406-804-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 GARDINER MT
2023-08-04 406-481-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2023-07-26 406-604-9XXX 9000–9999Assigned TELNYX LLC 073H GREATFALLS MT
2023-07-21 406-235-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F WOLF CREEK MT
2023-07-21 406-289-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F CONRAD MT
2023-07-21 406-405-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LIBBY MT
2023-07-21 406-503-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2023-07-21 406-503-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2023-07-21 406-503-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2023-07-21 406-512-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BOULDER MT
2023-07-21 406-626-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2023-07-21 406-646-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F WYELLOWSTN MT
2023-07-21 406-668-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2023-07-21 406-729-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F WILSALL MT
2023-07-21 406-748-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F COLSTRIP MT
2023-07-21 406-815-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2023-07-21 406-836-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2023-07-21 406-836-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2023-07-18 406-405-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2023-07-18 406-410-9XXX 9000–9999Assigned COMMIO, LLC 939H HELENA MT
2023-07-18 406-479-8XXX 8000–8999Assigned COMMIO, LLC 939H BUTTE MT
2023-07-18 406-499-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2023-07-18 406-519-6XXX 6000–6999Assigned COMMIO, LLC 939H MISSOULA MT
2023-07-12 406-481-2XXX 2000–2999Assigned BOOST SUBSCRIBERCO L.L.C. 490J MISSOULA MT
2023-07-12 406-605-4XXX 4000–4999Assigned BOOST SUBSCRIBERCO L.L.C. 490J BUTTE MT
2023-07-12 406-634-5XXX 5000–5999Assigned BOOST SUBSCRIBERCO L.L.C. 490J HELENA MT
2023-07-12 406-866-6XXX 6000–6999Assigned BOOST SUBSCRIBERCO L.L.C. 490J GREATFALLS MT
2023-07-06 406-346-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 FORSYTH MT
2023-07-03 406-613-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2023-07-03 406-790-4XXX 4000–4999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULBERTSON MT
2023-06-28 406-333-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2023-06-28 406-353-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HARLEM MT
2023-06-21 406-481-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2023-06-16 406-512-0XXX 0000–0999Assigned TELNYX LLC 073H BOULDER MT
2023-06-15 406-623-6XXX 6000–6999Assigned COMMIO, LLC 939H HARDIN MT
2023-06-13 406-679-7XXX 7000–7999Assigned NUSO, LLC 732J HARDIN MT
2023-06-12 406-858-5XXX 5000–5999Assigned BOOST SUBSCRIBERCO L.L.C. 490J KALISPELL MT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.