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
2021-05-27 406-609-7XXX 7000–7999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2021-05-24 406-703-0XXX 0000–0999Assigned TELNYX LLC 073H COLUMBUS MT
2021-05-13 406-499-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2021-05-13 406-800-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BRIDGER MT
2021-05-13 406-807-0XXX 0000–0999Assigned TELNYX LLC 073H EGLACIERPK MT
2021-05-13 406-813-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2021-05-12 406-970-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-05-12 406-970-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2021-05-06 406-608-1XXX 1000–1999Assigned IP HORIZON LLC 515J BILLINGS MT
2021-05-05 406-410-3XXX 3000–3999Assigned T-MOBILE USA, INC. 6529 HELENA MT
2021-04-26 406-515-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SUPERIOR MT
2021-04-23 406-894-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2021-04-22 406-604-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-04-22 406-604-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-04-22 406-604-5XXX 5000–5999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-04-22 406-604-6XXX 6000–6999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2021-04-22 406-807-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F EGLACIERPK MT
2021-04-20 406-220-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2021-04-20 406-220-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2021-04-19 406-605-0XXX 0000–0999Assigned TELNYX LLC 073H BUTTE MT
2021-04-17 406-310-4XXX 4000–4999Assigned BLACKFOOT COMMUNICATIONS, INC. - MT 7870 BUTTE MT
2021-04-16 406-316-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BOULDER MT
2021-04-14 406-901-9XXX 9000–9999Assigned ONVOY SPECTRUM, LLC 624H BILLINGS MT
2021-04-13 406-718-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F DARBY MT
2021-04-13 406-718-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F DARBY MT
2021-04-12 406-296-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F EUREKA MT
2021-04-12 406-316-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F BOULDER MT
2021-04-12 406-929-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F HUNGRYHORS MT
2021-04-09 406-353-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HARLEM MT
2021-04-09 406-357-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CHINOOK MT
2021-04-09 406-680-0XXX 0000–0999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MALTA MT
2021-04-07 406-419-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 VICTOR MT
2021-04-05 406-765-6XXX 6000–6999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G PLENTYWOOD MT
2021-03-26 406-602-9XXX 9000–9999Assigned AIRUS, INC. - MT 588H BOZEMAN MT
2021-03-25 406-609-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2021-03-25 406-609-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2021-03-23 406-380-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LEWISTOWN MT
2021-03-23 406-409-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-03-23 406-435-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-03-23 406-500-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-03-23 406-601-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-03-23 406-601-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2021-03-22 406-202-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2021-03-16 406-402-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2021-03-16 406-920-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2021-03-15 406-920-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2021-03-11 406-614-2XXX 2000–2999Assigned WESTERN MONTANA COMMUNITYTEL INC. - MT 986F BIGFORK MT
2021-02-28 406-391-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2021-02-28 406-614-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2021-02-28 406-614-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BIGFORK 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.