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
2021-07-15 406-527-6XXX 6000–6999Assigned NEW CINGULAR WIRELESS PCS, LLC 6010 SACO MT
2021-06-29 406-901-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BILLINGS MT
2021-06-28 406-402-2XXX 2000–2999Assigned T-MOBILE USA, INC. 6529 GREATFALLS MT
2021-06-23 406-643-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H NO PARKMAN MT
2021-06-23 406-840-3XXX 3000–3999Assigned ONVOY SPECTRUM, LLC 624H SILVERTIP MT
2021-06-22 406-316-2XXX 2000–2999Assigned ONVOY SPECTRUM, LLC 624H BOULDER MT
2021-06-22 406-505-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H CONRAD MT
2021-06-22 406-533-4XXX 4000–4999Assigned ONVOY SPECTRUM, LLC 624H BUTTE MT
2021-06-22 406-573-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H BROWNING MT
2021-06-22 406-614-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H BIGFORK MT
2021-06-22 406-691-8XXX 8000–8999Assigned ONVOY SPECTRUM, LLC 624H ANACONDA MT
2021-06-22 406-909-7XXX 7000–7999Assigned ONVOY SPECTRUM, LLC 624H COLUMBIFLS MT
2021-06-15 406-919-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2021-06-15 406-919-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BELGRADE MT
2021-06-11 406-969-0XXX 0000–0999Assigned SKYE TELECOM LLC DBA SKYETEL 622J BILLINGS MT
2021-06-08 406-266-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F TOWNSEND MT
2021-06-08 406-287-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F WHITEHALL MT
2021-06-08 406-419-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F VICTOR MT
2021-06-08 406-635-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F TERRY MT
2021-06-08 406-640-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F WYELLOWSTN MT
2021-06-08 406-729-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F WILSALL MT
2021-06-08 406-796-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2021-06-08 406-886-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F SWAN LAKE MT
2021-06-08 406-982-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F YELLOW BAY MT
2021-06-07 406-224-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F LIVINGSTON MT
2021-06-07 406-271-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F CONRAD MT
2021-06-07 406-298-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2021-06-07 406-299-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-06-07 406-299-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-06-07 406-310-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-06-07 406-310-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BUTTE MT
2021-06-07 406-319-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F POLSON MT
2021-06-07 406-319-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F POLSON MT
2021-06-07 406-341-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2021-06-07 406-365-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
2021-06-07 406-380-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2021-06-07 406-380-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2021-06-07 406-387-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F HUNGRYHORS MT
2021-06-07 406-389-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F HELENA MT
2021-06-07 406-389-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F HELENA MT
2021-06-07 406-389-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F HELENA MT
2021-06-07 406-389-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F HELENA MT
2021-06-07 406-393-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F SOMERS MT
2021-06-07 406-401-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-06-07 406-401-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-06-07 406-401-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-06-07 406-401-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2021-06-07 406-409-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2021-06-07 406-409-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2021-06-07 406-415-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F DEER LODGE 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.