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 |
|---|---|---|---|---|---|---|---|
| 2015-08-11 | 406-927-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BILLINGS | MT |
| 2015-08-11 | 406-927-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BILLINGS | MT |
| 2015-08-03 | 406-577-3XXX | 3000–3999 | Assigned | ONVOY, LLC - MT | 453F | BOZEMAN | MT |
| 2015-07-29 | 406-691-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ANACONDA | MT |
| 2015-07-17 | 406-936-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | CLYDE PARK | MT |
| 2015-07-14 | 406-578-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | WILSALL | MT |
| 2015-07-14 | 406-851-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | MILES CITY | MT |
| 2015-07-14 | 406-948-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | GLENDIVE | MT |
| 2015-07-07 | 406-802-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | HAMILTON | MT |
| 2015-06-02 | 406-318-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BILLINGS | MT |
| 2015-05-28 | 406-299-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BUTTE | MT |
| 2015-05-27 | 406-573-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MT | 9415 | BROWNING | MT |
| 2015-05-19 | 406-884-7XXX | 7000–7999 | Assigned | TELEPORT COMMUNICATIONS AMERICA MT - LLC | 771G | POLSON | MT |
| 2015-05-13 | 406-413-2XXX | 2000–2999 | Assigned | QWEST CORPORATION | 9636 | BILLINGS | MT |
| 2015-05-13 | 406-413-3XXX | 3000–3999 | Assigned | QWEST CORPORATION | 9636 | BILLINGS | MT |
| 2015-05-13 | 406-413-4XXX | 4000–4999 | Assigned | QWEST CORPORATION | 9636 | BILLINGS | MT |
| 2015-05-07 | 406-224-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | LIVINGSTON | MT |
| 2015-05-07 | 406-284-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | MANHATTAN | MT |
| 2015-05-07 | 406-426-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | RED LODGE | MT |
| 2015-05-07 | 406-478-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | SIDNEY | MT |
| 2015-05-07 | 406-616-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | THREEFORKS | MT |
| 2015-05-07 | 406-641-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | WYELLOWSTN | MT |
| 2015-05-06 | 406-213-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | COLSTRIP | MT |
| 2015-05-06 | 406-290-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | COLUMBUS | MT |
| 2015-05-06 | 406-518-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | GALATNGTWY | MT |
| 2015-05-06 | 406-530-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | LAUREL | MT |
| 2015-05-06 | 406-668-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | FROMBERG | MT |
| 2015-05-06 | 406-838-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | COOKE CITY | MT |
| 2015-04-23 | 406-863-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA MT - LLC | 771G | WHITEFISH | MT |
| 2015-04-15 | 406-201-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | FORSYTH | MT |
| 2015-04-15 | 406-201-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | FORSYTH | MT |
| 2015-04-15 | 406-404-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2015-04-15 | 406-404-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2015-04-15 | 406-404-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BOZEMAN | MT |
| 2015-03-31 | 406-905-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | JOLIET | MT |
| 2015-03-27 | 406-213-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | COLSTRIP | MT |
| 2015-03-09 | 406-621-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | FORTBENTON | MT |
| 2015-03-09 | 406-707-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | LEWISTOWN | MT |
| 2015-03-09 | 406-833-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT | 6564 | RONAN | MT |
| 2015-03-06 | 406-302-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WOLF CREEK | MT |
| 2015-03-06 | 406-818-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RED LODGE | MT |
| 2015-02-20 | 406-213-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | COLSTRIP | MT |
| 2015-02-20 | 406-800-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BRIDGER | MT |
| 2015-02-20 | 406-813-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BELGRADE | MT |
| 2015-02-17 | 406-659-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NO PARKMAN | MT |
| 2015-02-13 | 406-943-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA MT - LLC | 771G | SIDNEY | MT |
| 2015-02-12 | 406-574-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SILVERTIP | MT |
| 2015-02-09 | 406-303-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MISSOULA | MT |
| 2015-01-15 | 406-415-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | DEER LODGE | MT |
| 2014-12-09 | 406-318-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - MT | 994E | BILLINGS | 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.