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
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Jan 2026
Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-09-19 | 331-466-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-19 | 331-466-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-19 | 331-466-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-19 | 331-466-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-19 | 331-466-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-19 | 331-466-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-19 | 331-466-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2023-09-04 | 331-746-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | KANEVILLE | IL |
| 2023-08-23 | 331-224-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | ITASCA | IL |
| 2023-08-23 | 331-296-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2023-08-22 | 331-286-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | ST CHARLES | IL |
| 2023-08-18 | 331-291-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2023-08-09 | 331-297-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | BATAVIA | IL |
| 2023-08-09 | 331-298-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2023-08-08 | 331-232-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | W CHICAGO | IL |
| 2023-08-08 | 331-295-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | AURORA | IL |
| 2023-08-08 | 331-388-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | SUGARGROVE | IL |
| 2023-08-08 | 331-500-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2023-08-02 | 331-295-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AURORA | IL |
| 2023-07-25 | 331-288-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | ELBURN | IL |
| 2023-07-25 | 331-295-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AURORA | IL |
| 2023-07-21 | 331-288-0XXX | 0000–0999 | Assigned | COMMIO, LLC | 939H | ELBURN | IL |
| 2023-07-21 | 331-288-1XXX | 1000–1999 | Assigned | COMMIO, LLC | 939H | ELBURN | IL |
| 2023-07-21 | 331-288-2XXX | 2000–2999 | Assigned | COMMIO, LLC | 939H | ELBURN | IL |
| 2023-07-21 | 331-288-3XXX | 3000–3999 | Assigned | COMMIO, LLC | 939H | ELBURN | IL |
| 2023-07-21 | 331-288-4XXX | 4000–4999 | Assigned | COMMIO, LLC | 939H | ELBURN | IL |
| 2023-07-20 | 331-289-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2023-07-20 | 331-289-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2023-07-14 | 331-284-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2023-07-14 | 331-284-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2023-07-14 | 331-284-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2023-07-14 | 331-284-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2023-07-14 | 331-284-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2023-07-14 | 331-286-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | ST CHARLES | IL |
| 2023-07-14 | 331-286-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | ST CHARLES | IL |
| 2023-07-14 | 331-373-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2023-07-14 | 331-373-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2023-07-14 | 331-373-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2023-07-14 | 331-373-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2023-07-14 | 331-373-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2023-07-14 | 331-426-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2023-07-14 | 331-426-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2023-07-14 | 331-426-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2023-07-14 | 331-426-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2023-07-14 | 331-426-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2023-07-11 | 331-217-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | LOMBARD | IL |
| 2023-07-11 | 331-217-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | LOMBARD | IL |
| 2023-07-07 | 331-296-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2023-07-07 | 331-296-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2023-07-07 | 331-296-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | WHEATON | 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.