NumberResearchRecent thousands-block assignments
11 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 |
|---|---|---|---|---|---|---|---|
| 2024-11-08 | 331-322-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-11-08 | 331-335-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-11-08 | 331-335-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-11-08 | 331-335-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-10-24 | 331-326-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | DOWNERSGRV | IL |
| 2024-10-24 | 331-399-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | DOWNERSGRV | IL |
| 2024-10-24 | 331-400-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | OSWEGO | IL |
| 2024-10-22 | 331-314-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ST CHARLES | IL |
| 2024-10-22 | 331-325-2XXX | 2000–2999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | LEMONT | IL |
| 2024-10-21 | 331-322-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | LOMBARD | IL |
| 2024-10-18 | 331-267-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-10-17 | 331-224-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | ITASCA | IL |
| 2024-10-14 | 331-323-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | GLEN ELLYN | IL |
| 2024-10-07 | 331-266-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-10-04 | 331-326-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DOWNERSGRV | IL |
| 2024-10-01 | 331-345-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2024-08-29 | 331-298-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | NAPERVILLE | IL |
| 2024-08-29 | 331-335-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | ST CHARLES | IL |
| 2024-08-28 | 331-224-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | ITASCA | IL |
| 2024-08-27 | 331-322-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-08-08 | 331-335-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | ST CHARLES | IL |
| 2024-08-08 | 331-335-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | ST CHARLES | IL |
| 2024-07-16 | 331-202-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | ELMHURST | IL |
| 2024-07-16 | 331-312-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | AURORA | IL |
| 2024-07-16 | 331-312-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | AURORA | IL |
| 2024-07-16 | 331-312-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | AURORA | IL |
| 2024-07-16 | 331-312-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | AURORA | IL |
| 2024-07-11 | 331-326-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | DOWNERSGRV | IL |
| 2024-07-11 | 331-326-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | DOWNERSGRV | IL |
| 2024-07-11 | 331-326-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | DOWNERSGRV | IL |
| 2024-07-05 | 331-299-7XXX | 7000–7999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2024-07-05 | 331-322-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-07-05 | 331-322-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | IL |
| 2024-07-05 | 331-326-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2024-07-05 | 331-341-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | PLANO | IL |
| 2024-06-25 | 331-335-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-06-25 | 331-335-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ST CHARLES | IL |
| 2024-06-06 | 331-298-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2024-06-06 | 331-324-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | YORKVILLE | IL |
| 2024-06-05 | 331-299-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | HINSDALE | IL |
| 2024-05-30 | 331-293-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AURORA | IL |
| 2024-05-29 | 331-326-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2024-05-29 | 331-326-9XXX | 9000–9999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2024-05-28 | 331-312-4XXX | 4000–4999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | AURORA | IL |
| 2024-05-28 | 331-312-5XXX | 5000–5999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | AURORA | IL |
| 2024-05-23 | 331-317-5XXX | 5000–5999 | Assigned | NUSO, LLC | 478J | HINSDALE | IL |
| 2024-05-23 | 331-317-6XXX | 6000–6999 | Assigned | NUSO, LLC | 478J | HINSDALE | IL |
| 2024-05-21 | 331-224-7XXX | 7000–7999 | Assigned | PEERLESS NETWORK OF ILLINOIS, LLC - IL | 063E | ITASCA | IL |
| 2024-05-21 | 331-298-4XXX | 4000–4999 | Assigned | NUSO, LLC | 732J | NAPERVILLE | IL |
| 2024-05-21 | 331-319-5XXX | 5000–5999 | Assigned | NUSO, LLC | 732J | AURORA | IL |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.