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
2011-08-19 406-272-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2011-07-22 406-926-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MISSOULA MT
2011-07-15 406-604-4XXX 4000–4999Assigned BLACKFOOT COMMUNICATIONS, INC. - MT 7870 GREATFALLS MT
2011-07-13 406-426-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E RED LODGE MT
2011-07-13 406-478-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E SIDNEY MT
2011-07-13 406-478-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E SIDNEY MT
2011-07-13 406-530-7XXX 7000–7999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LAUREL MT
2011-07-13 406-530-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LAUREL MT
2011-07-13 406-578-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WILSALL MT
2011-07-13 406-578-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WILSALL MT
2011-07-13 406-948-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GLENDIVE MT
2011-07-13 406-948-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GLENDIVE MT
2011-07-08 406-380-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LEWISTOWN MT
2011-07-08 406-551-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2011-07-05 406-616-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F THREEFORKS MT
2011-06-28 406-571-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F FINLEY PT MT
2011-06-28 406-577-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BOZEMAN MT
2011-06-28 406-840-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F SILVERTIP MT
2011-06-27 406-407-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 KALISPELL MT
2011-06-21 406-203-2XXX 2000–2999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2011-06-21 406-407-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2011-06-21 406-623-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F HARDIN MT
2011-06-21 406-795-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2011-06-21 406-865-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F DILLON MT
2011-06-21 406-888-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F W GLACIER MT
2011-06-21 406-897-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F COLUMBIFLS MT
2011-06-21 406-969-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2011-06-10 406-361-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAMILTON MT
2011-06-09 406-224-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2011-06-09 406-273-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2011-06-09 406-273-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2011-06-09 406-478-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2011-06-08 406-437-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2011-06-08 406-694-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2011-06-08 406-694-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2011-06-07 406-334-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2011-06-07 406-407-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2011-06-07 406-407-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2011-06-02 406-285-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E THREEFORKS MT
2011-05-24 406-219-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2011-05-24 406-272-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2011-05-24 406-272-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2011-05-24 406-282-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MANHATTAN MT
2011-05-06 406-210-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SEELEYLAKE MT
2011-05-06 406-274-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2011-05-06 406-274-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2011-05-06 406-564-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2011-05-06 406-564-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2011-05-06 406-633-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LAUREL MT
2011-05-06 406-694-5XXX 5000–5999Assigned 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.