NumberResearchRecent thousands-block assignments
11 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 331
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 |
|---|---|---|---|---|---|---|---|
| 2024-02-07 | 331-309-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2024-02-07 | 331-341-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | PLANO | IL |
| 2024-02-07 | 331-341-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PLANO | IL |
| 2024-02-07 | 331-341-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | PLANO | IL |
| 2024-02-06 | 331-224-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | ITASCA | IL |
| 2024-02-02 | 331-252-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | WARRENVL | IL |
| 2024-02-02 | 331-288-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | ELBURN | IL |
| 2024-02-02 | 331-341-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | PLANO | IL |
| 2024-01-31 | 331-297-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | BATAVIA | IL |
| 2024-01-31 | 331-297-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | BATAVIA | IL |
| 2024-01-31 | 331-373-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2024-01-31 | 331-373-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2024-01-31 | 331-373-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2024-01-31 | 331-837-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | W CHICAGO | IL |
| 2024-01-31 | 331-837-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | W CHICAGO | IL |
| 2024-01-30 | 331-320-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-30 | 331-320-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-30 | 331-320-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-30 | 331-320-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-30 | 331-320-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-30 | 331-320-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-30 | 331-320-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-01-29 | 331-202-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | ELMHURST | IL |
| 2024-01-29 | 331-225-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | ELMHURST | IL |
| 2024-01-29 | 331-279-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | ELMHURST | IL |
| 2024-01-29 | 331-314-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | ST CHARLES | IL |
| 2024-01-29 | 331-314-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | ST CHARLES | IL |
| 2024-01-29 | 331-314-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | ST CHARLES | IL |
| 2024-01-29 | 331-314-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | ST CHARLES | IL |
| 2024-01-29 | 331-317-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2024-01-29 | 331-317-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2024-01-29 | 331-317-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2024-01-29 | 331-826-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | ELMHURST | IL |
| 2024-01-24 | 331-319-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | AURORA | IL |
| 2024-01-24 | 331-319-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | AURORA | IL |
| 2024-01-24 | 331-319-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | AURORA | IL |
| 2024-01-24 | 331-319-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | AURORA | IL |
| 2024-01-24 | 331-319-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | AURORA | IL |
| 2024-01-23 | 331-316-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2024-01-23 | 331-316-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2024-01-23 | 331-316-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2024-01-23 | 331-316-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2024-01-19 | 331-217-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-01-12 | 331-282-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | HINSDALE | IL |
| 2024-01-11 | 331-334-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BATAVIA | IL |
| 2024-01-09 | 331-224-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ITASCA | IL |
| 2024-01-09 | 331-224-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ITASCA | IL |
| 2024-01-05 | 331-317-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | HINSDALE | IL |
| 2024-01-05 | 331-317-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | HINSDALE | IL |
| 2024-01-05 | 331-317-2XXX | 2000–2999 | Assigned | COMMIO, LLC | 939H | HINSDALE | IL |
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.