NumberResearchRecent thousands-block assignments
0 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, all time — NPA 331
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-02-25 | 331-373-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | OSWEGO | IL |
| 2022-02-25 | 331-627-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | LOMBARD | IL |
| 2022-02-18 | 331-252-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WARRENVL | IL |
| 2022-02-18 | 331-426-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | LEMONT | IL |
| 2022-02-17 | 331-288-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ELBURN | IL |
| 2022-02-17 | 331-466-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | GLEN ELLYN | IL |
| 2022-02-17 | 331-688-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | NAPERVILLE | IL |
| 2022-02-17 | 331-746-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | KANEVILLE | IL |
| 2022-02-16 | 331-272-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ST CHARLES | IL |
| 2022-01-13 | 331-866-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WHEATON | IL |
| 2022-01-07 | 331-837-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | W CHICAGO | 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.