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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2020-09-14 406-308-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CASCADE MT
2020-09-11 406-574-8XXX 8000–8999Assigned NUSO, LLC 478J SILVERTIP MT
2020-09-06 406-506-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-09-06 406-506-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-09-06 406-506-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2020-09-06 406-792-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BUTTE MT
2020-09-06 406-792-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BUTTE MT
2020-09-06 406-792-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F BUTTE MT
2020-09-06 406-926-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-09-06 406-926-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-09-06 406-926-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2020-09-06 406-964-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2020-09-06 406-964-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2020-09-06 406-964-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F GREATFALLS MT
2020-09-03 406-520-5XXX 5000–5999Assigned HD CARRIER LLC 321J ABSAROKEE MT
2020-09-03 406-719-8XXX 8000–8999Assigned HD CARRIER LLC 321J FROMBERG MT
2020-09-03 406-812-6XXX 6000–6999Assigned HD CARRIER LLC 321J LAUREL MT
2020-09-01 406-290-6XXX 6000–6999Assigned TELNYX LLC 073H COLUMBUS MT
2020-08-26 406-317-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2020-08-25 406-304-1XXX 1000–1999Assigned T-MOBILE USA, INC. 6529 MISSOULA MT
2020-08-24 406-506-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2020-08-10 406-295-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F TROY MT
2020-08-10 406-296-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F EUREKA MT
2020-08-10 406-334-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F LIBBY MT
2020-08-10 406-634-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F HELENA MT
2020-08-10 406-634-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F HELENA MT
2020-08-06 406-468-6XXX 6000–6999Assigned CHARTER IP ENABLED SERVICES, LLC 792K CASCADE MT
2020-07-28 406-501-7XXX 7000–7999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G WHITEHALL MT
2020-07-28 406-616-5XXX 5000–5999Assigned TELEPORT COMMUNICATIONS AMERICA MT - LLC 771G THREEFORKS MT
2020-07-20 406-205-9XXX 9000–9999Assigned TELNYX LLC 073H GREATFALLS MT
2020-07-20 406-235-5XXX 5000–5999Assigned TELNYX LLC 073H WOLF CREEK MT
2020-07-20 406-309-7XXX 7000–7999Assigned TELNYX LLC 073H KALISPELL MT
2020-07-20 406-319-1XXX 1000–1999Assigned TELNYX LLC 073H POLSON MT
2020-07-20 406-324-9XXX 9000–9999Assigned TELNYX LLC 073H HELENA MT
2020-07-20 406-380-8XXX 8000–8999Assigned TELNYX LLC 073H LEWISTOWN MT
2020-07-20 406-387-0XXX 0000–0999Assigned TELNYX LLC 073H HUNGRYHORS MT
2020-07-20 406-419-0XXX 0000–0999Assigned TELNYX LLC 073H VICTOR MT
2020-07-20 406-424-0XXX 0000–0999Assigned TELNYX LLC 073H SHELBY MT
2020-07-20 406-501-1XXX 1000–1999Assigned TELNYX LLC 073H WHITEHALL MT
2020-07-20 406-508-0XXX 0000–0999Assigned TELNYX LLC 073H FRENCHTOWN MT
2020-07-20 406-521-8XXX 8000–8999Assigned TELNYX LLC 073H TOWNSEND MT
2020-07-20 406-612-9XXX 9000–9999Assigned TELNYX LLC 073H SWAN LAKE MT
2020-07-20 406-625-1XXX 1000–1999Assigned TELNYX LLC 073H STEVENSVL MT
2020-07-20 406-692-9XXX 9000–9999Assigned TELNYX LLC 073H YELLOW BAY MT
2020-07-20 406-693-3XXX 3000–3999Assigned TELNYX LLC 073H WARM SPG MT
2020-07-20 406-709-9XXX 9000–9999Assigned TELNYX LLC 073H LAKESIDE MT
2020-07-20 406-730-0XXX 0000–0999Assigned TELNYX LLC 073H WHITEFISH MT
2020-07-20 406-732-0XXX 0000–0999Assigned TELNYX LLC 073H ST MARY MT
2020-07-20 406-802-1XXX 1000–1999Assigned TELNYX LLC 073H HAMILTON MT
2020-07-20 406-808-0XXX 0000–0999Assigned TELNYX LLC 073H HAVRE 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.