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 475
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-08-06 | 475-396-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2015-06-26 | 475-619-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2015-06-05 | 475-897-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | GREENWICH | CT |
| 2015-06-02 | 475-330-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | FAIRFIELD | CT |
| 2015-05-18 | 475-549-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | MILFORD | CT |
| 2015-05-18 | 475-888-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | FAIRFIELD | CT |
| 2015-04-29 | 475-558-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | NEW CANAAN | CT |
| 2015-03-04 | 475-619-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2014-11-20 | 475-449-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2014-11-05 | 475-209-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | NEW HAVEN | CT |
| 2014-07-23 | 475-328-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | DARIEN | CT |
| 2013-06-06 | 475-999-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | FAIRFIELD | CT |
| 2013-03-18 | 475-422-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2013-02-20 | 475-282-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2012-08-29 | 475-282-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | 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.