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
2021-10-21 406-573-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BROWNING MT
2021-10-21 406-614-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BIGFORK MT
2021-10-21 406-614-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BIGFORK MT
2021-10-21 406-643-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H NO PARKMAN MT
2021-10-21 406-659-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H NO PARKMAN MT
2021-10-21 406-840-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H SILVERTIP MT
2021-10-21 406-840-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H SILVERTIP MT
2021-10-19 406-316-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BOULDER MT
2021-10-18 406-608-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2021-10-18 406-608-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2021-10-18 406-608-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2021-10-18 406-608-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2021-10-18 406-608-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2021-10-15 406-703-8XXX 8000–8999Assigned COMMIO, LLC 939H COLUMBUS MT
2021-10-15 406-703-9XXX 9000–9999Assigned COMMIO, LLC 939H COLUMBUS MT
2021-10-06 406-559-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H ANACONDA MT
2021-10-06 406-605-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2021-10-06 406-605-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2021-10-06 406-605-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2021-10-06 406-605-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2021-10-06 406-909-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H COLUMBIFLS MT
2021-10-06 406-952-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-10-06 406-952-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-10-06 406-964-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-10-06 406-964-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-10-05 406-635-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J TERRY MT
2021-10-01 406-391-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2021-09-20 406-258-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2021-09-20 406-303-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2021-09-17 406-316-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BOULDER MT
2021-09-15 406-519-7XXX 7000–7999Assigned IP HORIZON LLC 515J MISSOULA MT
2021-09-10 406-609-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 KALISPELL MT
2021-09-08 406-558-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HELENA MT
2021-09-02 406-215-8XXX 8000–8999Assigned SKYE TELECOM LLC DBA SKYETEL 622J MISSOULA MT
2021-08-31 406-247-9XXX 9000–9999Assigned TERRA NOVA TELECOM INC. 145J BILLINGS MT
2021-08-31 406-321-7XXX 7000–7999Assigned TERRA NOVA TELECOM INC. 145J COLUMBUS MT
2021-08-31 406-749-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J COLSTRIP MT
2021-08-31 406-823-7XXX 7000–7999Assigned TERRA NOVA TELECOM INC. 145J LIVINGSTON MT
2021-08-27 406-219-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2021-08-17 406-938-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 ALZADA MT
2021-08-17 406-990-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 LAME DEER MT
2021-08-09 406-703-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E COLUMBUS MT
2021-08-04 406-283-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LIBBY MT
2021-08-04 406-296-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F EUREKA MT
2021-08-04 406-316-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BOULDER MT
2021-08-04 406-703-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2021-08-04 406-807-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F EGLACIERPK MT
2021-07-26 406-970-4XXX 4000–4999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-07-26 406-970-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-07-26 406-970-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 BILLINGS 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.