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
2011-12-08 406-414-1XXX 1000–1999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2011-12-08 406-414-2XXX 2000–2999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2011-12-08 406-414-3XXX 3000–3999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2011-12-08 406-414-4XXX 4000–4999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2011-12-08 406-414-5XXX 5000–5999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2011-12-01 406-812-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAUREL MT
2011-11-03 406-926-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K MISSOULA MT
2011-11-02 406-309-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K KALISPELL MT
2011-10-27 406-204-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 HELENA MT
2011-10-27 406-551-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BOZEMAN MT
2011-10-19 406-315-2XXX 2000–2999Assigned CHARTER IP ENABLED SERVICES, LLC 792K GREATFALLS MT
2011-10-06 406-302-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F WOLF CREEK MT
2011-10-06 406-812-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F LAUREL MT
2011-10-06 406-905-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F JOLIET MT
2011-09-30 406-518-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F GALATNGTWY MT
2011-09-30 406-626-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2011-09-30 406-969-3XXX 3000–3999Assigned CHARTER IP ENABLED SERVICES, LLC 792K BILLINGS MT
2011-09-28 406-284-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F MANHATTAN MT
2011-09-28 406-287-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F WHITEHALL MT
2011-09-28 406-446-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2011-09-28 406-521-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F TOWNSEND MT
2011-09-28 406-578-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F WILSALL MT
2011-09-28 406-625-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F STEVENSVL MT
2011-09-28 406-630-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F SIDNEY MT
2011-09-28 406-637-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F TERRY MT
2011-09-28 406-641-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F WYELLOWSTN MT
2011-09-28 406-642-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F VICTOR MT
2011-09-28 406-659-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F NO PARKMAN MT
2011-09-28 406-693-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F WARM SPG MT
2011-09-28 406-732-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F ST MARY MT
2011-09-28 406-823-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F LIVINGSTON MT
2011-09-28 406-852-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2011-09-23 406-351-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2011-09-23 406-415-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2011-09-23 406-476-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F DUTTON MT
2011-09-23 406-505-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F CONRAD MT
2011-09-23 406-780-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2011-09-23 406-797-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2011-09-23 406-845-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2011-09-23 406-848-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F GARDINER MT
2011-09-22 406-226-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F EGLACIERPK MT
2011-09-22 406-668-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F FROMBERG MT
2011-09-22 406-686-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F CLYDE PARK MT
2011-09-22 406-838-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F COOKE CITY MT
2011-09-20 406-470-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F SHELBY MT
2011-09-20 406-813-3XXX 3000–3999Assigned MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BELGRADE MT
2011-09-12 406-361-7XXX 7000–7999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2011-08-31 406-468-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CASCADE MT
2011-08-31 406-897-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 COLUMBIFLS MT
2011-08-23 406-272-4XXX 4000–4999Assigned BANDWIDTH.COM CLEC, LLC - MT 994E BILLINGS 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.