NumberResearchRecent thousands-block assignments
10 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
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
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
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-06-07 | 406-517-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LIVINGSTON | MT |
| 2024-06-05 | 406-930-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BIG TIMBER | MT |
| 2024-05-31 | 406-991-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | MARION | MT |
| 2024-05-08 | 406-481-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | MISSOULA | MT |
| 2024-05-08 | 406-677-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | SEELEYLAKE | MT |
| 2024-04-25 | 406-496-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BUTTE | MT |
| 2024-04-10 | 406-922-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BOZEMAN | MT |
| 2024-04-08 | 406-558-5XXX | 5000–5999 | Assigned | ONVOY, LLC - MT | 453F | HELENA | MT |
| 2024-04-08 | 406-558-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MT | 453F | HELENA | MT |
| 2024-04-08 | 406-558-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MT | 453F | HELENA | MT |
| 2024-03-29 | 406-391-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MT | 453F | CUT BANK | MT |
| 2024-03-29 | 406-736-2XXX | 2000–2999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | STOCKETT | MT |
| 2024-03-29 | 406-836-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MT | 453F | GREATFALLS | MT |
| 2024-03-29 | 406-836-8XXX | 8000–8999 | Assigned | ONVOY, LLC - MT | 453F | GREATFALLS | MT |
| 2024-03-29 | 406-866-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MT | 453F | GREATFALLS | MT |
| 2024-03-27 | 406-718-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | DARBY | MT |
| 2024-03-25 | 406-310-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-03-18 | 406-405-6XXX | 6000–6999 | Assigned | ONVOY, LLC - MT | 453F | LIBBY | MT |
| 2024-03-18 | 406-507-0XXX | 0000–0999 | Assigned | ONVOY, LLC - MT | 453F | WHITEFISH | MT |
| 2024-03-18 | 406-516-1XXX | 1000–1999 | Assigned | ONVOY, LLC - MT | 453F | LAUREL | MT |
| 2024-03-18 | 406-951-9XXX | 9000–9999 | Assigned | ONVOY, LLC - MT | 453F | MILES CITY | MT |
| 2024-03-08 | 406-593-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MT | 453F | BUTTE | MT |
| 2024-03-08 | 406-605-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MT | 453F | BUTTE | MT |
| 2024-03-06 | 406-686-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | CLYDE PARK | MT |
| 2024-03-06 | 406-936-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CLYDE PARK | MT |
| 2024-03-05 | 406-833-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | RONAN | MT |
| 2024-02-28 | 406-332-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | PABLO | MT |
| 2024-02-23 | 406-894-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-02-23 | 406-894-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-02-23 | 406-969-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-02-22 | 406-425-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | RED LODGE | MT |
| 2024-02-22 | 406-629-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | HARDIN | MT |
| 2024-02-22 | 406-662-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BRIDGER | MT |
| 2024-02-22 | 406-703-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | COLUMBUS | MT |
| 2024-02-22 | 406-743-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | LAUREL | MT |
| 2024-02-22 | 406-905-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | JOLIET | MT |
| 2024-02-22 | 406-997-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | FROMBERG | MT |
| 2024-02-12 | 406-204-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | HELENA | MT |
| 2024-02-06 | 406-322-7XXX | 7000–7999 | Assigned | COMMIO, LLC | 939H | COLUMBUS | MT |
| 2024-02-05 | 406-325-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | BILLINGS | MT |
| 2024-02-05 | 406-325-2XXX | 2000–2999 | Assigned | COMMIO, LLC | 939H | BILLINGS | MT |
| 2024-02-05 | 406-325-3XXX | 3000–3999 | Assigned | COMMIO, LLC | 939H | BILLINGS | MT |
| 2024-02-05 | 406-325-9XXX | 9000–9999 | Assigned | COMMIO, LLC | 939H | BILLINGS | MT |
| 2024-01-24 | 406-440-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | HELENA | MT |
| 2024-01-24 | 406-440-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HELENA | MT |
| 2024-01-24 | 406-481-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2024-01-24 | 406-481-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2024-01-24 | 406-997-9XXX | 9000–9999 | Assigned | AT&T - LOCAL | 7421 | FROMBERG | MT |
| 2024-01-23 | 406-955-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | KALISPELL | MT |
| 2024-01-19 | 406-625-9XXX | 9000–9999 | Assigned | AT&T - LOCAL | 7421 | STEVENSVL | 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.