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
2021-01-12 406-518-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F GALATNGTWY MT
2021-01-12 406-518-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F GALATNGTWY MT
2021-01-12 406-616-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F THREEFORKS MT
2021-01-12 406-643-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F NO PARKMAN MT
2021-01-12 406-643-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F NO PARKMAN MT
2021-01-12 406-692-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F YELLOW BAY MT
2021-01-12 406-692-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F YELLOW BAY MT
2021-01-12 406-708-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2021-01-12 406-708-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2021-01-12 406-719-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2021-01-12 406-719-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2021-01-12 406-740-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F COLSTRIP MT
2021-01-12 406-740-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F COLSTRIP MT
2021-01-12 406-820-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F OLNEY MT
2021-01-12 406-820-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F OLNEY MT
2021-01-11 406-573-0XXX 0000–0999Assigned SIYEH COMMUNICATIONS 619J BROWNING MT
2021-01-08 406-310-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BUTTE MT
2021-01-08 406-409-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-01-08 406-876-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-01-08 406-876-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-01-08 406-876-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-01-05 406-401-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-01-05 406-401-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-01-05 406-401-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-01-05 406-401-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2020-12-28 406-393-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 SOMERS MT
2020-12-22 406-345-4XXX 4000–4999Assigned TERRA NOVA TELECOM INC. 145J GLENDIVE MT
2020-12-22 406-742-3XXX 3000–3999Assigned TERRA NOVA TELECOM INC. 145J FAIRVIEW MT
2020-12-11 406-304-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2020-12-11 406-401-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2020-12-07 406-614-0XXX 0000–0999Assigned TELNYX LLC 073H BIGFORK MT
2020-12-02 406-920-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2020-11-19 406-969-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2020-11-19 406-969-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2020-11-18 406-743-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LAUREL MT
2020-11-10 406-303-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-11-10 406-303-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-11-10 406-303-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-11-10 406-303-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-11-10 406-430-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F HELENA MT
2020-11-10 406-916-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F HELENA MT
2020-11-10 406-916-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F HELENA MT
2020-11-10 406-916-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F HELENA MT
2020-11-04 406-831-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-11-04 406-831-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-11-04 406-831-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-11-04 406-831-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-10-29 406-334-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2020-10-20 406-333-3XXX 3000–3999Assigned TERRA NOVA TELECOM INC. 145J LIVINGSTON MT
2020-10-20 406-763-3XXX 3000–3999Assigned TERRA NOVA TELECOM INC. 145J GALATNGTWY 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.