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 |
|---|---|---|---|---|---|---|---|
| 2024-12-05 | 406-235-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WOLF CREEK | MT |
| 2024-12-05 | 406-417-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | HELENA | MT |
| 2024-12-05 | 406-645-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DEER LODGE | MT |
| 2024-12-05 | 406-865-1XXX | 1000–1999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DILLON | MT |
| 2024-12-05 | 406-980-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | TOWNSEND | MT |
| 2024-11-27 | 406-229-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CUT BANK | MT |
| 2024-11-27 | 406-434-1XXX | 1000–1999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SHELBY | MT |
| 2024-11-27 | 406-707-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | LEWISTOWN | MT |
| 2024-11-27 | 406-807-1XXX | 1000–1999 | Assigned | ONVOY SPECTRUM, LLC | 624H | EGLACIERPK | MT |
| 2024-11-27 | 406-808-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | HAVRE | MT |
| 2024-11-24 | 406-576-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CONRAD | MT |
| 2024-11-24 | 406-940-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MOLT | MT |
| 2024-11-14 | 406-517-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LIVINGSTON | MT |
| 2024-11-13 | 406-298-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | COLUMBUS | MT |
| 2024-10-31 | 406-417-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HELENA | MT |
| 2024-10-16 | 406-633-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LAUREL | MT |
| 2024-10-14 | 406-660-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DILLON | MT |
| 2024-10-14 | 406-964-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GREATFALLS | MT |
| 2024-10-03 | 406-677-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | SEELEYLAKE | MT |
| 2024-10-03 | 406-919-8XXX | 8000–8999 | Assigned | TELEPORT COMMUNICATIONS AMERICA MT - LLC | 771G | BELGRADE | MT |
| 2024-10-02 | 406-955-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | KALISPELL | MT |
| 2024-09-27 | 406-558-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | HELENA | MT |
| 2024-09-24 | 406-387-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNGRYHORS | MT |
| 2024-09-24 | 406-593-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | MT |
| 2024-09-23 | 406-378-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BIG SANDY | MT |
| 2024-09-23 | 406-466-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | CHOTEAU | MT |
| 2024-09-18 | 406-626-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FRENCHTOWN | MT |
| 2024-09-11 | 406-318-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-09-11 | 406-330-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | CLINTON | MT |
| 2024-09-11 | 406-373-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-09-11 | 406-517-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | LIVINGSTON | MT |
| 2024-09-04 | 406-426-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | RED LODGE | MT |
| 2024-08-30 | 406-405-7XXX | 7000–7999 | Assigned | ONVOY, LLC - MT | 453F | LIBBY | MT |
| 2024-08-30 | 406-513-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HELENA | MT |
| 2024-08-30 | 406-513-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HELENA | MT |
| 2024-08-28 | 406-475-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HELENA | MT |
| 2024-08-28 | 406-475-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | HELENA | MT |
| 2024-08-16 | 406-489-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SIDNEY | MT |
| 2024-08-15 | 406-405-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LIBBY | MT |
| 2024-08-14 | 406-749-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | COLSTRIP | MT |
| 2024-08-13 | 406-699-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HARDIN | MT |
| 2024-08-13 | 406-955-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | KALISPELL | MT |
| 2024-07-12 | 406-993-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BIG SKY | MT |
| 2024-06-26 | 406-818-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RED LODGE | MT |
| 2024-06-25 | 406-651-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BILLINGS | MT |
| 2024-06-25 | 406-760-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | GREATFALLS | MT |
| 2024-06-18 | 406-891-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BAKER | MT |
| 2024-06-13 | 406-324-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HELENA | MT |
| 2024-06-13 | 406-929-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNGRYHORS | MT |
| 2024-06-11 | 406-310-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | BUTTE | 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.