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
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2023-01-13 | 331-343-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2023-01-13 | 331-343-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2023-01-13 | 331-343-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2023-01-12 | 331-294-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2023-01-12 | 331-294-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2023-01-12 | 331-294-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2023-01-10 | 331-293-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AURORA | IL |
| 2023-01-09 | 331-287-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AURORA | IL |
| 2023-01-09 | 331-290-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | AURORA | IL |
| 2023-01-06 | 331-289-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | HINSDALE | IL |
| 2022-11-22 | 331-290-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | AURORA | IL |
| 2022-11-15 | 331-313-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | NAPERVILLE | IL |
| 2022-11-15 | 331-866-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2022-11-15 | 331-866-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2022-11-15 | 331-866-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | WHEATON | IL |
| 2022-11-08 | 331-388-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | SUGARGROVE | IL |
| 2022-11-02 | 331-283-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2022-11-01 | 331-286-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | ST CHARLES | IL |
| 2022-11-01 | 331-313-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2022-11-01 | 331-313-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL | 6333 | NAPERVILLE | IL |
| 2022-10-27 | 331-334-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | BATAVIA | IL |
| 2022-10-18 | 331-279-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | ELMHURST | IL |
| 2022-10-18 | 331-279-4XXX | 4000–4999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | ELMHURST | IL |
| 2022-10-18 | 331-279-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | ELMHURST | IL |
| 2022-10-18 | 331-426-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | LEMONT | IL |
| 2022-10-18 | 331-426-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | LEMONT | IL |
| 2022-10-18 | 331-866-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | WHEATON | IL |
| 2022-10-18 | 331-866-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | WHEATON | IL |
| 2022-10-18 | 331-866-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | WHEATON | IL |
| 2022-10-18 | 331-866-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | WHEATON | IL |
| 2022-10-18 | 331-866-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | WHEATON | IL |
| 2022-10-14 | 331-292-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-3XXX | 3000–3999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DOWNERSGRV | IL |
| 2022-10-14 | 331-292-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | DOWNERSGRV | IL |
| 2022-10-05 | 331-291-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DOWNERSGRV | IL |
| 2022-10-05 | 331-291-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | DOWNERSGRV | IL |
| 2022-10-05 | 331-631-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DOWNERSGRV | IL |
| 2022-10-05 | 331-631-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DOWNERSGRV | IL |
| 2022-10-04 | 331-290-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | AURORA | IL |
| 2022-10-03 | 331-290-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - IL | 984E | AURORA | IL |
| 2022-09-20 | 331-286-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | ST CHARLES | IL |
| 2022-09-20 | 331-286-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | ST CHARLES | IL |
| 2022-09-13 | 331-277-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | LOMBARD | 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.