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 |
|---|---|---|---|---|---|---|---|
| 2006-03-06 | 406-897-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | COLUMBIFLS | MT |
| 2006-03-03 | 406-319-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | POLSON | MT |
| 2006-03-02 | 406-422-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HELENA | MT |
| 2006-03-01 | 406-866-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | GREATFALLS | MT |
| 2006-02-28 | 406-534-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BILLINGS | MT |
| 2006-02-10 | 406-314-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| 2006-02-09 | 406-281-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BILLINGS | MT |
| 2006-02-07 | 406-262-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HAVRE | MT |
| 2006-02-07 | 406-314-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | KALISPELL | MT |
| 2005-12-19 | 406-551-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BOZEMAN | MT |
| 2005-12-09 | 406-322-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | COLUMBUS | MT |
| 2005-11-16 | 406-334-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LIBBY | MT |
| 2005-09-27 | 406-534-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BILLINGS | MT |
| 2005-09-02 | 406-625-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | STEVENSVL | MT |
| 2005-08-31 | 406-281-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BILLINGS | MT |
| 2005-08-31 | 406-314-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| 2005-07-19 | 406-545-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BILLINGS | MT |
| 2005-07-14 | 406-314-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| 2005-06-17 | 406-493-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MISSOULA | MT |
| 2005-06-07 | 406-924-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BELGRADE | MT |
| 2005-06-03 | 406-952-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | GREATFALLS | MT |
| 2005-06-01 | 406-284-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MANHATTAN | MT |
| 2005-05-23 | 406-281-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BILLINGS | MT |
| 2005-05-17 | 406-624-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BOZEMAN | MT |
| 2005-05-09 | 406-564-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | GREATFALLS | MT |
| 2005-04-07 | 406-565-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BUTTE | MT |
| 2005-03-21 | 406-422-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HELENA | MT |
| 2005-03-10 | 406-534-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BILLINGS | MT |
| 2005-02-25 | 406-630-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | SIDNEY | MT |
| 2005-02-23 | 406-623-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | HARDIN | MT |
| 2005-02-23 | 406-708-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | LEWISTOWN | MT |
| 2005-02-03 | 406-281-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BILLINGS | MT |
| 2005-02-03 | 406-988-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | DILLON | MT |
| 2005-01-28 | 406-748-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | COLSTRIP | MT |
| 2005-01-28 | 406-873-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | CUT BANK | MT |
| 2005-01-27 | 406-233-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | MILES CITY | MT |
| 2005-01-27 | 406-365-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | GLENDIVE | MT |
| 2005-01-27 | 406-434-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | SHELBY | MT |
| 2005-01-14 | 406-552-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | MISSOULA | MT |
| 2005-01-04 | 406-552-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | MISSOULA | MT |
| 2005-01-03 | 406-314-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| 2004-12-15 | 406-545-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BILLINGS | MT |
| 2004-10-27 | 406-924-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BELGRADE | MT |
| 2004-10-22 | 406-314-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | KALISPELL | MT |
| 2004-10-22 | 406-373-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | BILLINGS | MT |
| 2004-10-15 | 406-282-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | MANHATTAN | MT |
| 2004-10-15 | 406-285-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | THREEFORKS | MT |
| 2004-10-15 | 406-322-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | COLUMBUS | MT |
| 2004-10-15 | 406-333-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | LIVINGSTON | MT |
| 2004-10-15 | 406-445-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | RED LODGE | 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.