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
2020-04-20 406-420-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BIGFORK MT
2020-04-10 406-312-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2020-04-10 406-312-9XXX 9000–9999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2020-04-08 406-301-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 MALTA MT
2020-03-26 406-926-8XXX 8000–8999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 MISSOULA MT
2020-03-12 406-589-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 BOZEMAN MT
2020-03-05 406-229-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2020-03-05 406-306-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2020-03-05 406-313-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F BOULDER MT
2020-03-05 406-313-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F BOULDER MT
2020-03-05 406-344-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F HAVRE MT
2020-03-05 406-501-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F WHITEHALL MT
2020-03-05 406-717-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-03-05 406-717-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-03-03 406-602-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H BOZEMAN MT
2020-03-03 406-630-9XXX 9000–9999Assigned AIRUS, INC. - MT 588H SIDNEY MT
2020-03-03 406-998-5XXX 5000–5999Assigned AIRUS, INC. - MT 588H BILLINGS MT
2020-03-02 406-821-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 DARBY MT
2020-02-26 406-607-5XXX 5000–5999Assigned T-MOBILE USA, INC. 6529 KALISPELL MT
2020-02-26 406-661-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2020-02-26 406-661-6XXX 6000–6999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2020-02-26 406-661-8XXX 8000–8999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2020-02-26 406-970-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2020-02-26 406-998-3XXX 3000–3999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2020-02-26 406-998-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2020-02-21 406-359-8XXX 8000–8999Assigned AIRUS, INC. - MT 588H GLENDIVE MT
2020-02-06 406-944-9XXX 9000–9999Assigned AIRUS, INC. - MT 588H MILES CITY MT
2020-02-06 406-957-1XXX 1000–1999Assigned AIRUS, INC. - MT 588H TERRY MT
2020-01-31 406-353-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HARLEM MT
2020-01-31 406-357-7XXX 7000–7999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CHINOOK MT
2020-01-31 406-759-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CHESTER MT
2020-01-24 406-283-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F LIBBY MT
2020-01-24 406-295-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F TROY MT
2020-01-24 406-313-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BOULDER MT
2020-01-24 406-802-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2020-01-15 406-624-7XXX 7000–7999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 BOZEMAN MT
2020-01-07 406-304-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2020-01-07 406-306-9XXX 9000–9999Assigned TELNYX LLC 073H MANHATTAN MT
2020-01-07 406-402-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2020-01-06 406-317-4XXX 4000–4999Assigned TELNYX LLC 073H MISSOULA MT
2020-01-03 406-561-0XXX 0000–0999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2020-01-03 406-561-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2019-12-12 406-417-9XXX 9000–9999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 HELENA MT
2019-12-11 406-306-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2019-12-11 406-306-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2019-12-11 406-418-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F COOKE CITY MT
2019-12-11 406-418-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F COOKE CITY MT
2019-12-11 406-719-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2019-12-11 406-719-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2019-12-11 406-740-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F COLSTRIP 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.