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
2020-10-20 406-962-2XXX 2000–2999Assigned TERRA NOVA TELECOM INC. 145J JOLIET MT
2020-10-14 406-409-8XXX 8000–8999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2020-10-14 406-409-9XXX 9000–9999Assigned T-MOBILE USA, INC. 6529 BILLINGS MT
2020-10-14 406-614-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F BIGFORK MT
2020-10-14 406-624-2XXX 2000–2999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2020-10-14 406-624-5XXX 5000–5999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BOZEMAN MT
2020-10-12 406-213-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F COLSTRIP MT
2020-10-12 406-341-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2020-10-12 406-341-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2020-10-12 406-416-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2020-10-12 406-416-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2020-10-12 406-518-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F GALATNGTWY MT
2020-10-12 406-616-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F THREEFORKS MT
2020-10-12 406-641-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F WYELLOWSTN MT
2020-10-12 406-643-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F NO PARKMAN MT
2020-10-12 406-719-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2020-10-12 406-729-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F WILSALL MT
2020-10-12 406-743-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F LAUREL MT
2020-10-12 406-747-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F FAIRVIEW MT
2020-10-12 406-795-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F WIBAUX MT
2020-10-12 406-800-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BRIDGER MT
2020-10-12 406-800-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F BRIDGER MT
2020-10-12 406-815-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2020-10-12 406-815-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2020-10-12 406-943-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F SIDNEY MT
2020-10-09 406-289-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F CONRAD MT
2020-10-09 406-308-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F CASCADE MT
2020-10-09 406-316-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F BOULDER MT
2020-10-09 406-369-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2020-10-09 406-419-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F VICTOR MT
2020-10-09 406-476-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F DUTTON MT
2020-10-09 406-501-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F WHITEHALL MT
2020-10-09 406-508-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2020-10-09 406-571-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F FINLEY PT MT
2020-10-09 406-612-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F SWAN LAKE MT
2020-10-09 406-625-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F STEVENSVL MT
2020-10-09 406-631-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F ELMO MT
2020-10-09 406-645-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2020-10-09 406-692-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F YELLOW BAY MT
2020-10-09 406-693-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F WARM SPG MT
2020-10-09 406-707-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F LEWISTOWN MT
2020-10-09 406-732-1XXX 1000–1999Assigned ONVOY SPECTRUM, LLC 624H ST MARY MT
2020-10-09 406-797-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2020-10-09 406-980-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F TOWNSEND MT
2020-10-08 406-425-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 RED LODGE MT
2020-10-08 406-506-1XXX 1000–1999Assigned HD CARRIER LLC 321J BILLINGS MT
2020-10-08 406-506-2XXX 2000–2999Assigned HD CARRIER LLC 321J BILLINGS MT
2020-10-08 406-520-6XXX 6000–6999Assigned HD CARRIER LLC 321J ABSAROKEE MT
2020-10-08 406-812-9XXX 9000–9999Assigned HD CARRIER LLC 321J LAUREL MT
2020-10-07 406-501-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 WHITEHALL 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.