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 |
|---|---|---|---|---|---|---|---|
| 2004-10-15 | 406-578-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | WILSALL | MT |
| 2004-10-15 | 406-628-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | LAUREL | MT |
| 2004-10-15 | 406-646-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | WYELLOWSTN | MT |
| 2004-10-15 | 406-662-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BRIDGER | MT |
| 2004-10-15 | 406-668-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | FROMBERG | MT |
| 2004-10-15 | 406-686-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | CLYDE PARK | MT |
| 2004-10-15 | 406-763-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | GALATNGTWY | MT |
| 2004-10-15 | 406-838-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | COOKE CITY | MT |
| 2004-10-15 | 406-848-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | GARDINER | MT |
| 2004-10-15 | 406-962-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | JOLIET | MT |
| 2004-09-08 | 406-545-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BILLINGS | MT |
| 2004-09-08 | 406-545-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BILLINGS | MT |
| 2004-09-08 | 406-558-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HELENA | MT |
| 2004-09-08 | 406-565-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BUTTE | MT |
| 2004-08-13 | 406-371-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | BILLINGS | MT |
| 2004-08-11 | 406-451-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | BOZEMAN | MT |
| 2004-08-11 | 406-451-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | BOZEMAN | MT |
| 2004-08-05 | 406-218-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | MISSOULA | MT |
| 2004-08-05 | 406-218-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | MISSOULA | MT |
| 2004-08-05 | 406-836-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | GREATFALLS | MT |
| 2004-07-27 | 406-437-9XXX | 9000–9999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HELENA | MT |
| 2004-06-11 | 406-731-8XXX | 8000–8999 | Assigned | QWEST CORPORATION | 9636 | GREATFALLS | MT |
| 2004-03-15 | 406-624-0XXX | 0000–0999 | Assigned | MONTANA OPTICOM, LLC - MT | 746D | BOZEMAN | 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.