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 |
|---|---|---|---|---|---|---|---|
| 2024-05-21 | 331-319-6XXX | 6000–6999 | Assigned | NUSO, LLC | 732J | AURORA | IL |
| 2024-05-15 | 331-298-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | NAPERVILLE | IL |
| 2024-05-14 | 331-325-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2024-05-09 | 331-316-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2024-05-09 | 331-316-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2024-04-30 | 331-296-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2024-04-30 | 331-316-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2024-04-30 | 331-316-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2024-04-30 | 331-320-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | BARTLETT | IL |
| 2024-04-30 | 331-322-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-04-30 | 331-335-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-04-26 | 331-217-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | LOMBARD | IL |
| 2024-04-26 | 331-283-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GENEVA | IL |
| 2024-04-17 | 331-317-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2024-04-12 | 331-326-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DOWNERSGRV | IL |
| 2024-04-09 | 331-224-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | ITASCA | IL |
| 2024-03-28 | 331-326-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2024-03-27 | 331-202-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | ELMHURST | IL |
| 2024-03-21 | 331-216-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | OSWEGO | IL |
| 2024-03-21 | 331-217-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | LOMBARD | IL |
| 2024-03-21 | 331-297-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BATAVIA | IL |
| 2024-03-21 | 331-314-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | ST CHARLES | IL |
| 2024-03-21 | 331-325-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | LEMONT | IL |
| 2024-03-21 | 331-341-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | PLANO | IL |
| 2024-03-21 | 331-746-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | KANEVILLE | IL |
| 2024-03-21 | 331-850-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | BIG ROCK | IL |
| 2024-03-13 | 331-324-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | YORKVILLE | IL |
| 2024-03-13 | 331-324-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | YORKVILLE | IL |
| 2024-03-06 | 331-373-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2024-03-06 | 331-400-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | OSWEGO | IL |
| 2024-03-06 | 331-800-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | W CHICAGO | IL |
| 2024-03-06 | 331-800-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | W CHICAGO | IL |
| 2024-03-05 | 331-297-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | BATAVIA | IL |
| 2024-03-05 | 331-297-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | BATAVIA | IL |
| 2024-02-26 | 331-225-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ELMHURST | IL |
| 2024-02-13 | 331-388-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | SUGARGROVE | IL |
| 2024-02-08 | 331-283-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2024-02-08 | 331-314-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | IL |
| 2024-02-08 | 331-314-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | IL |
| 2024-02-08 | 331-314-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | IL |
| 2024-02-08 | 331-322-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | LOMBARD | IL |
| 2024-02-08 | 331-322-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | LOMBARD | IL |
| 2024-02-08 | 331-322-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | LOMBARD | IL |
| 2024-02-08 | 331-323-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2024-02-08 | 331-323-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | GLEN ELLYN | IL |
| 2024-02-07 | 331-296-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2024-02-07 | 331-296-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2024-02-07 | 331-296-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2024-02-07 | 331-309-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | LEMONT | IL |
| 2024-02-07 | 331-309-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | LEMONT | 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.