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 231
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-03-07 | 231-663-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | MESICK | MI |
| 2022-03-07 | 231-772-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WELLSTON | MI |
| 2022-02-28 | 231-963-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | MCBAIN | MI |
| 2022-02-24 | 231-872-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | REED CITY | MI |
| 2022-02-22 | 231-566-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | HARRIETTA | MI |
| 2022-02-22 | 231-699-9XXX | 9000–9999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | FOUNTAIN | MI |
| 2022-02-22 | 231-966-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | FREESOIL | MI |
| 2022-02-18 | 231-626-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | LEVERING | MI |
| 2022-02-18 | 231-746-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | CHEBOYGAN | MI |
| 2021-09-03 | 231-278-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | HESPERIA | MI |
| 2021-08-10 | 231-367-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WOLVERINE | MI |
| 2021-08-10 | 231-763-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | AMBLE | MI |
| 2021-08-05 | 231-466-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | EVART | MI |
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.