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
2019-10-17 406-858-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2019-10-17 406-858-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2019-10-17 406-858-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2019-10-17 406-898-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2019-10-17 406-898-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2019-10-17 406-898-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2019-10-17 406-898-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2019-10-16 406-408-0XXX 0000–0999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HAYS MT
2019-10-08 406-944-8XXX 8000–8999Assigned AIRUS, INC. - MT 588H MILES CITY MT
2019-10-01 406-894-4XXX 4000–4999Assigned COMMIO, LLC 939H BILLINGS MT
2019-09-30 406-201-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2019-09-30 406-226-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F EGLACIERPK MT
2019-09-30 406-302-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F WOLF CREEK MT
2019-09-30 406-306-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2019-09-30 406-308-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F CASCADE MT
2019-09-30 406-313-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BOULDER MT
2019-09-30 406-344-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F HAVRE MT
2019-09-30 406-345-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
2019-09-30 406-415-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2019-09-30 406-430-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F HELENA MT
2019-09-30 406-446-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2019-09-30 406-470-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F SHELBY MT
2019-09-30 406-500-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2019-09-30 406-500-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2019-09-30 406-505-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F CONRAD MT
2019-09-30 406-623-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F HARDIN MT
2019-09-30 406-708-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2019-09-30 406-740-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F COLSTRIP MT
2019-09-30 406-747-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2019-09-30 406-780-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2019-09-30 406-797-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2019-09-30 406-802-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2019-09-30 406-812-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LAUREL MT
2019-09-30 406-837-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2019-09-30 406-844-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LAKESIDE MT
2019-09-30 406-884-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F POLSON MT
2019-09-30 406-909-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F COLUMBIFLS MT
2019-09-30 406-936-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F CLYDE PARK MT
2019-09-30 406-946-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LIVINGSTON MT
2019-09-30 406-991-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F MARION MT
2019-09-26 406-952-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H GREATFALLS MT
2019-09-16 406-389-2XXX 2000–2999Assigned CENTURYLINK COMMUNICATIONS, LLC 508J HELENA MT
2019-09-12 406-295-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F TROY MT
2019-09-12 406-296-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F EUREKA MT
2019-09-12 406-334-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LIBBY MT
2019-09-10 406-518-8XXX 8000–8999Assigned TELNYX LLC 073H GALATNGTWY MT
2019-08-26 406-418-0XXX 0000–0999Assigned TELNYX LLC 073H COOKE CITY MT
2019-08-26 406-719-0XXX 0000–0999Assigned TELNYX LLC 073H FROMBERG MT
2019-08-26 406-804-0XXX 0000–0999Assigned TELNYX LLC 073H GARDINER MT
2019-08-21 406-418-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F COOKE CITY 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.