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.
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-11-08 | 423-709-4XXX | 4000–4999 | Assigned | NUSO, LLC | 478J | CLEVELAND | TN |
| 2024-11-08 | 423-709-5XXX | 5000–5999 | Assigned | NUSO, LLC | 478J | CLEVELAND | TN |
| 2024-10-31 | 423-904-7XXX | 7000–7999 | Assigned | NUSO, LLC | 478J | CHATTNOOGA | TN |
| 2024-10-31 | 423-980-4XXX | 4000–4999 | Assigned | NUSO, LLC | 478J | CHATTNOOGA | TN |
| 2024-08-28 | 423-906-4XXX | 4000–4999 | Assigned | NUSO, LLC | 478J | JOHNSON CY | TN |
| 2024-08-28 | 423-906-5XXX | 5000–5999 | Assigned | NUSO, LLC | 478J | JOHNSON CY | TN |
| 2024-05-16 | 423-906-2XXX | 2000–2999 | Assigned | NUSO, LLC | 478J | JOHNSON CY | TN |
| 2024-05-16 | 423-906-3XXX | 3000–3999 | Assigned | NUSO, LLC | 478J | JOHNSON CY | TN |
| 2023-12-06 | 423-656-9XXX | 9000–9999 | Assigned | NUSO, LLC | 478J | JOHNSON CY | TN |
| 2023-06-14 | 423-819-3XXX | 3000–3999 | Assigned | NUSO, LLC | 732J | CLEVELAND | TN |
| 2023-03-02 | 423-831-1XXX | 1000–1999 | Assigned | NUSO, LLC | 732J | GREENEVL | TN |
| 2021-12-03 | 423-719-2XXX | 2000–2999 | Assigned | NUSO, LLC | 478J | CHATTNOOGA | TN |
| 2021-12-02 | 423-705-2XXX | 2000–2999 | Assigned | NUSO, LLC | 478J | JOHNSON CY | TN |
| 2018-02-07 | 423-524-1XXX | 1000–1999 | Assigned | NUSO, LLC | 551G | JOHNSON CY | TN |
| 2013-03-13 | 423-430-1XXX | 1000–1999 | Assigned | NUSO, LLC | 551G | JOHNSON CY | TN |
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.