NumberResearchRecent thousands-block assignments
0 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, all time — NPA 351
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-03-09 | 351-333-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | HARVARD | MA |
| 2022-03-02 | 351-226-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WESTFORD | MA |
| 2022-02-17 | 351-588-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | HAVERHILL | MA |
| 2022-02-16 | 351-233-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ASHBURNHAM | MA |
| 2022-02-16 | 351-266-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | PRINCETON | MA |
| 2022-02-16 | 351-426-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | DANVERS | MA |
| 2022-02-15 | 351-227-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | BOLTON | MA |
| 2022-02-11 | 351-746-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WINCHENDON | MA |
| 2022-01-07 | 351-688-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | GEORGETOWN | MA |
| 2022-01-06 | 351-837-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ASHBY | MA |
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.