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
2021-06-07 406-416-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2021-06-07 406-418-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F COOKE CITY MT
2021-06-07 406-445-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2021-06-07 406-470-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F SHELBY MT
2021-06-07 406-506-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2021-06-07 406-506-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BILLINGS MT
2021-06-07 406-508-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2021-06-07 406-508-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2021-06-07 406-518-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F GALATNGTWY MT
2021-06-07 406-519-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2021-06-07 406-519-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2021-06-07 406-519-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F MISSOULA MT
2021-06-07 406-571-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F FINLEY PT MT
2021-06-07 406-574-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F SILVERTIP MT
2021-06-07 406-609-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2021-06-07 406-609-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2021-06-07 406-609-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F KALISPELL MT
2021-06-07 406-614-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2021-06-07 406-638-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F HARDIN MT
2021-06-07 406-638-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F HARDIN MT
2021-06-07 406-643-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F NO PARKMAN MT
2021-06-07 406-720-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F COLSTRIP MT
2021-06-07 406-742-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2021-06-07 406-743-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F LAUREL MT
2021-06-07 406-743-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F LAUREL MT
2021-06-07 406-797-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2021-06-07 406-797-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2021-06-07 406-804-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F GARDINER MT
2021-06-07 406-849-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F ELMO MT
2021-06-07 406-851-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2021-06-07 406-851-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2021-06-07 406-854-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F MARION MT
2021-06-07 406-865-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F DILLON MT
2021-06-07 406-865-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F DILLON MT
2021-06-07 406-873-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2021-06-07 406-879-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F HAVRE MT
2021-06-07 406-879-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F HAVRE MT
2021-06-07 406-881-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F OLNEY MT
2021-06-07 406-898-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2021-06-07 406-898-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2021-06-07 406-905-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F JOLIET MT
2021-06-07 406-909-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F COLUMBIFLS MT
2021-06-07 406-919-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BELGRADE MT
2021-06-07 406-919-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BELGRADE MT
2021-06-07 406-920-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2021-06-07 406-936-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F CLYDE PARK MT
2021-06-07 406-943-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F SIDNEY MT
2021-06-07 406-943-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F SIDNEY MT
2021-06-03 406-519-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 MISSOULA MT
2021-05-27 406-609-6XXX 6000–6999Assigned T-MOBILE USA, INC. 6529 KALISPELL 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.