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
Clear Download CSV ↓
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 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.