NumberResearchRecent thousands-block assignments
3 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, last 30 days — NPA 475
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-09-16 | 475-368-2XXX | 2000–2999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2026-09-16 | 475-368-3XXX | 3000–3999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2026-09-16 | 475-368-4XXX | 4000–4999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2026-06-04 | 475-850-6XXX | 6000–6999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2026-06-04 | 475-850-9XXX | 9000–9999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2025-04-02 | 475-368-6XXX | 6000–6999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2025-04-02 | 475-368-7XXX | 7000–7999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2025-04-02 | 475-368-9XXX | 9000–9999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2024-07-01 | 475-368-1XXX | 1000–1999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2024-07-01 | 475-368-8XXX | 8000–8999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2023-07-21 | 475-850-2XXX | 2000–2999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2023-07-21 | 475-850-3XXX | 3000–3999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2020-03-24 | 475-889-4XXX | 4000–4999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2020-03-24 | 475-889-5XXX | 5000–5999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2019-12-10 | 475-259-4XXX | 4000–4999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2019-12-10 | 475-259-6XXX | 6000–6999 | Assigned | CSC WIRELESS, LLC | 425J | DARIEN | CT |
| 2019-05-07 | 475-257-0XXX | 0000–0999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2019-05-07 | 475-257-1XXX | 1000–1999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2019-05-07 | 475-257-7XXX | 7000–7999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2019-05-07 | 475-257-8XXX | 8000–8999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2019-05-07 | 475-257-9XXX | 9000–9999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
| 2019-03-29 | 475-257-2XXX | 2000–2999 | Assigned | CSC WIRELESS, LLC | 425J | NORWALK | CT |
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.