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
2010-07-26 406-647-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2010-07-23 406-927-0XXX 0000–0999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2010-07-23 406-927-1XXX 1000–1999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BILLINGS MT
2010-07-19 406-530-3XXX 3000–3999Assigned MONTANA OPTICOM, LLC - MT 746D LAUREL MT
2010-07-19 406-694-0XXX 0000–0999Assigned MONTANA OPTICOM, LLC - MT 746D BILLINGS MT
2010-07-19 406-823-1XXX 1000–1999Assigned MONTANA OPTICOM, LLC - MT 746D LIVINGSTON MT
2010-07-19 406-924-8XXX 8000–8999Assigned MONTANA OPTICOM, LLC - MT 746D BELGRADE MT
2010-06-30 406-629-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HARDIN MT
2010-06-30 406-865-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DILLON MT
2010-06-30 406-944-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 MILES CITY MT
2010-06-30 406-948-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 GLENDIVE MT
2010-06-09 406-438-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2010-06-09 406-565-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BUTTE MT
2010-06-01 406-534-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2010-05-21 406-633-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LAUREL MT
2010-05-19 406-219-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2010-05-19 406-272-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2010-05-06 406-224-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIVINGSTON MT
2010-05-06 406-548-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BOZEMAN MT
2010-04-12 406-415-1XXX 1000–1999Assigned CHARTER IP ENABLED SERVICES, LLC 792K DEER LODGE MT
2010-04-05 406-291-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 LIBBY MT
2010-04-05 406-890-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2010-03-16 406-247-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS MT
2010-03-08 406-403-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 GREATFALLS MT
2010-03-08 406-420-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2010-03-08 406-552-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2010-03-08 406-552-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2010-03-08 406-852-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MILES CITY MT
2010-03-08 406-890-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2010-02-12 406-548-6XXX 6000–6999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2010-02-10 406-399-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SOUTHHAVRE MT
2010-01-22 406-219-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2010-01-22 406-224-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E LIVINGSTON MT
2010-01-22 406-282-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MANHATTAN MT
2010-01-22 406-351-0XXX 0000–0999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E FORSYTH MT
2010-01-22 406-640-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E WYELLOWSTN MT
2010-01-22 406-686-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E CLYDE PARK MT
2010-01-22 406-763-1XXX 1000–1999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E GALATNGTWY MT
2010-01-22 406-852-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E MILES CITY MT
2010-01-22 406-924-3XXX 3000–3999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2010-01-22 406-962-6XXX 6000–6999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E JOLIET MT
2010-01-08 406-470-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SHELBY MT
2010-01-08 406-478-1XXX 1000–1999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 SIDNEY MT
2010-01-08 406-552-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA MT
2010-01-08 406-565-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BUTTE MT
2010-01-08 406-647-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2010-01-08 406-647-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2010-01-08 406-890-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 KALISPELL MT
2010-01-05 406-845-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CUT BANK MT
2009-12-07 406-552-2XXX 2000–2999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MISSOULA 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.