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
2013-02-12 406-876-4XXX 4000–4999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2013-02-12 406-876-5XXX 5000–5999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2013-02-01 406-218-3XXX 3000–3999Assigned QWEST CORPORATION 9636 MISSOULA MT
2013-02-01 406-218-5XXX 5000–5999Assigned QWEST CORPORATION 9636 MISSOULA MT
2013-02-01 406-414-8XXX 8000–8999Assigned QWEST CORPORATION 9636 BOZEMAN MT
2013-01-30 406-299-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MT 9415 BUTTE MT
2013-01-09 406-845-9XXX 9000–9999Assigned CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 CUT BANK MT
2012-12-18 406-445-4XXX 4000–4999Assigned TRI TEL, INC. - MT 935G RED LODGE MT
2012-12-18 406-623-2XXX 2000–2999Assigned TRI TEL, INC. - MT 935G HARDIN MT
2012-12-18 406-633-7XXX 7000–7999Assigned TRI TEL, INC. - MT 935G LAUREL MT
2012-12-18 406-662-2XXX 2000–2999Assigned TRI TEL, INC. - MT 935G BRIDGER MT
2012-12-18 406-668-2XXX 2000–2999Assigned TRI TEL, INC. - MT 935G FROMBERG MT
2012-12-18 406-905-2XXX 2000–2999Assigned TRI TEL, INC. - MT 935G JOLIET MT
2012-12-12 406-948-6XXX 6000–6999Assigned ONVOY, LLC - MT 453F GLENDIVE MT
2012-12-11 406-508-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F FRENCHTOWN MT
2012-12-11 406-606-1XXX 1000–1999Assigned TRI TEL, INC. - MT 935G BILLINGS MT
2012-11-21 406-201-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2012-11-21 406-201-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F FORSYTH MT
2012-11-21 406-229-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F CUT BANK MT
2012-11-21 406-289-8XXX 8000–8999Assigned ONVOY, LLC - MT 453F CONRAD MT
2012-11-21 406-289-9XXX 9000–9999Assigned ONVOY, LLC - MT 453F CONRAD MT
2012-11-21 406-298-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F COLUMBUS MT
2012-11-21 406-302-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F WOLF CREEK MT
2012-11-21 406-361-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2012-11-21 406-361-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F HAMILTON MT
2012-11-21 406-404-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2012-11-21 406-404-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F BOZEMAN MT
2012-11-21 406-415-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F DEER LODGE MT
2012-11-21 406-426-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F RED LODGE MT
2012-11-21 406-476-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F DUTTON MT
2012-11-21 406-518-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F GALATNGTWY MT
2012-11-21 406-521-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F TOWNSEND MT
2012-11-21 406-559-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F ANACONDA MT
2012-11-21 406-571-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F FINLEY PT MT
2012-11-21 406-616-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F THREEFORKS MT
2012-11-21 406-625-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F STEVENSVL MT
2012-11-21 406-629-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F HARDIN MT
2012-11-21 406-629-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F HARDIN MT
2012-11-21 406-637-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F TERRY MT
2012-11-21 406-641-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F WYELLOWSTN MT
2012-11-21 406-643-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F NO PARKMAN MT
2012-11-21 406-823-3XXX 3000–3999Assigned ONVOY, LLC - MT 453F LIVINGSTON MT
2012-11-21 406-823-4XXX 4000–4999Assigned ONVOY, LLC - MT 453F LIVINGSTON MT
2012-11-21 406-840-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F SILVERTIP MT
2012-11-21 406-905-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F JOLIET MT
2012-11-21 406-944-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2012-11-21 406-944-5XXX 5000–5999Assigned ONVOY, LLC - MT 453F MILES CITY MT
2012-11-21 406-966-1XXX 1000–1999Assigned ONVOY, LLC - MT 453F SHELBY MT
2012-11-21 406-966-2XXX 2000–2999Assigned ONVOY, LLC - MT 453F SHELBY MT
2012-11-19 406-313-0XXX 0000–0999Assigned ONVOY, LLC - MT 453F BOULDER 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.