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
2023-01-25 406-216-0XXX 0000–0999Assigned 3 RIVERS TELEPHONE COOPERATIVE, INC. - MT 3924 GREATFALLS MT
2023-01-25 406-328-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 ABSAROKEE MT
2023-01-25 406-550-8XXX 8000–8999Assigned TELNYX LLC 073H MISSOULA MT
2023-01-25 406-550-9XXX 9000–9999Assigned TELNYX LLC 073H MISSOULA MT
2023-01-17 406-468-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CASCADE MT
2023-01-12 406-409-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2023-01-10 406-897-1XXX 1000–1999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F COLUMBIFLS MT
2022-12-27 406-357-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CHINOOK MT
2022-12-27 406-849-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 ELMO MT
2022-12-20 406-262-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HAVRE MT
2022-12-12 406-318-2XXX 2000–2999Assigned TELNYX LLC 073H BILLINGS MT
2022-12-12 406-614-3XXX 3000–3999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G BIGFORK MT
2022-12-12 406-790-5XXX 5000–5999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 CULBERTSON MT
2022-12-08 406-410-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 HELENA MT
2022-12-08 406-410-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 HELENA MT
2022-12-08 406-680-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MALTA MT
2022-12-01 406-405-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2022-12-01 406-410-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2022-12-01 406-416-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 FORSYTH MT
2022-12-01 406-438-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2022-12-01 406-499-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2022-12-01 406-613-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2022-11-30 406-479-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BUTTE MT
2022-11-21 406-609-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2022-11-18 406-213-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J COLSTRIP MT
2022-11-09 406-289-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F CONRAD MT
2022-11-09 406-923-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2022-11-09 406-923-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2022-11-04 406-380-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2022-10-28 406-858-9XXX 9000–9999Assigned TELNYX LLC 073H KALISPELL MT
2022-10-19 406-702-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2022-10-19 406-760-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2022-10-19 406-831-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2022-10-19 406-831-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2022-10-19 406-876-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2022-10-17 406-359-5XXX 5000–5999Assigned COMMIO, LLC 939H GLENDIVE MT
2022-10-14 406-606-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-606-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-606-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-717-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-717-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-717-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-867-0XXX 0000–0999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-867-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-867-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-14 406-867-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2022-10-11 406-601-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BILLINGS MT
2022-09-29 406-225-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BOULDER MT
2022-09-29 406-225-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BOULDER MT
2022-09-29 406-296-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F EUREKA 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.