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
2008-08-01 406-437-7XXX 7000–7999Assigned QWEST CORPORATION 9636 HELENA MT
2008-07-31 406-258-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2008-07-18 406-217-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2008-07-18 406-274-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2008-07-18 406-274-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2008-07-18 406-422-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2008-07-10 406-221-7XXX 7000–7999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BUTTE MT
2008-07-07 406-962-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 JOLIET MT
2008-07-03 406-647-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2008-06-10 406-260-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2008-06-10 406-260-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2008-06-10 406-839-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2008-06-10 406-839-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2008-06-10 406-839-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2008-05-29 406-417-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2008-05-21 406-952-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K GREATFALLS MT
2008-05-08 406-301-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MALTA MT
2008-05-01 406-530-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 LAUREL MT
2008-04-23 406-770-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K GREATFALLS MT
2008-04-09 406-422-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2008-04-09 406-422-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2008-04-08 406-513-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HELENA MT
2008-04-08 406-730-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K WHITEFISH MT
2008-04-04 406-260-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KALISPELL MT
2008-03-28 406-422-4XXX 4000–4999Assigned CHARTER IP ENABLED SERVICES, LLC 792K HELENA MT
2008-02-21 406-281-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2008-02-14 406-217-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2008-02-14 406-839-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2008-02-14 406-839-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2008-02-14 406-839-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2008-01-31 406-298-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 COLUMBUS MT
2008-01-23 406-290-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 COLUMBUS MT
2008-01-23 406-451-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2008-01-23 406-451-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2008-01-16 406-290-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 COLUMBUS MT
2008-01-11 406-241-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2008-01-11 406-241-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2008-01-11 406-241-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2008-01-11 406-274-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2007-12-26 406-260-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2007-12-26 406-260-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2007-12-26 406-260-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2007-12-26 406-533-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BUTTE MT
2007-12-05 406-290-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 COLUMBUS MT
2007-11-16 406-422-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2007-11-16 406-422-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2007-11-16 406-451-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2007-11-16 406-451-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2007-11-16 406-794-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2007-11-16 406-794-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 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.