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 517
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-03-22 | 517-468-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | BELL OAK | MI |
| 2022-03-22 | 517-686-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ALBION | MI |
| 2022-03-22 | 517-732-5XXX | 5000–5999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | PORTLAND | MI |
| 2022-03-22 | 517-842-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | GRASS LAKE | MI |
| 2022-03-15 | 517-298-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | MORENCI | MI |
| 2022-03-15 | 517-344-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | JACKSON | MI |
| 2022-03-15 | 517-666-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | GRANDLEDGE | MI |
| 2022-02-28 | 517-746-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | COLDWATER | MI |
| 2022-02-24 | 517-427-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | RIVES JCT | MI |
| 2022-02-22 | 517-399-9XXX | 9000–9999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | EATON RPD | MI |
| 2022-02-22 | 517-426-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | MUNITH | MI |
| 2022-02-22 | 517-733-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ADDISON | MI |
| 2022-02-16 | 517-436-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | SAND CREEK | MI |
| 2022-02-16 | 517-774-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | COLDWTR LK | MI |
| 2022-01-11 | 517-837-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | TECUMSEH | MI |
| 2022-01-06 | 517-767-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | TEKONSHA | MI |
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.