NumberResearch Membership · Data 09/21/2026

Recent thousands-block assignments

10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026

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
2024-01-18 406-221-0XXX 0000–0999Assigned TELNYX LLC 073H BUTTE MT
2024-01-16 406-409-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2024-01-16 406-503-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2024-01-12 406-503-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2024-01-12 406-503-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2024-01-12 406-503-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2024-01-12 406-503-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2024-01-12 406-901-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2024-01-02 406-622-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FORTBENTON MT
2023-12-20 406-405-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2023-12-20 406-421-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOMILES CY MT
2023-12-20 406-930-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BIG TIMBER MT
2023-12-11 406-955-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2023-12-11 406-955-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2023-12-07 406-319-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 POLSON MT
2023-12-07 406-387-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HUNGRYHORS MT
2023-12-07 406-467-0XXX 0000–0999Assigned 3 RIVERS TEL. COOP., INC. 2255 FAIRFIELD MT
2023-12-07 406-682-0XXX 0000–0999Assigned 3 RIVERS TEL. COOP., INC. 2255 ENNIS MT
2023-12-07 406-854-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 MARION MT
2023-12-07 406-887-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 FINLEY PT MT
2023-12-07 406-995-0XXX 0000–0999Assigned 3 RIVERS TEL. COOP., INC. 2255 BIG SKY MT
2023-12-01 406-502-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2023-12-01 406-516-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LAUREL MT
2023-12-01 406-849-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 ELMO MT
2023-11-30 406-481-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2023-11-30 406-833-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RONAN MT
2023-11-28 406-410-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2023-11-27 406-964-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 GREATFALLS MT
2023-11-15 406-574-5XXX 5000–5999Assigned NUSO, LLC 478J SILVERTIP MT
2023-11-15 406-574-6XXX 6000–6999Assigned NUSO, LLC 478J SILVERTIP MT
2023-11-15 406-898-6XXX 6000–6999Assigned NUSO, LLC 478J BOZEMAN MT
2023-11-13 406-499-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2023-11-13 406-629-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HARDIN MT
2023-11-13 406-740-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLSTRIP MT
2023-11-13 406-749-5XXX 5000–5999Assigned RANGE TELEPHONE COOPERATIVE, INC. - MT 8140 COLSTRIP MT
2023-11-09 406-438-8XXX 8000–8999Assigned TELNYX LLC 073H HELENA MT
2023-11-09 406-438-9XXX 9000–9999Assigned TELNYX LLC 073H HELENA MT
2023-11-01 406-220-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2023-10-25 406-479-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2023-10-25 406-497-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2023-10-25 406-605-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2023-10-25 406-605-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2023-10-25 406-605-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2023-10-23 406-417-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2023-10-20 406-410-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2023-10-16 406-624-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2023-09-27 406-848-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 GARDINER MT
2023-09-25 406-866-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2023-09-25 406-965-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H GREATFALLS MT
2023-09-18 406-481-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.