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 203
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-06-26 | 203-557-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | WESTPORT | CT |
| 2014-04-16 | 203-890-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2014-04-03 | 203-857-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2014-04-02 | 203-290-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2013-08-15 | 203-990-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | OLDGRNWICH | CT |
| 2013-07-10 | 203-998-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2013-05-31 | 203-762-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | WILTON | CT |
| 2013-05-10 | 203-664-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | REDDING | CT |
| 2013-05-10 | 203-693-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | MILFORD | CT |
| 2013-03-06 | 203-957-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2013-02-20 | 203-724-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2012-08-29 | 203-939-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2012-07-19 | 203-658-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2012-02-27 | 203-900-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | GREENWICH | CT |
| 2012-02-27 | 203-914-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2011-11-07 | 203-817-0XXX | 0000–0999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2011-09-28 | 203-690-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2011-07-27 | 203-553-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | NEW HAVEN | CT |
| 2011-07-27 | 203-614-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2011-07-27 | 203-920-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | NEW CANAAN | CT |
| 2011-07-20 | 203-309-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | DARIEN | CT |
| 2011-05-26 | 203-693-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | MILFORD | CT |
| 2011-05-25 | 203-489-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | GREENWICH | CT |
| 2011-05-25 | 203-957-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2011-04-05 | 203-295-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2011-03-24 | 203-595-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2011-03-24 | 203-916-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2011-03-24 | 203-955-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | FAIRFIELD | CT |
| 2011-01-31 | 203-717-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | GREENWICH | CT |
| 2010-11-02 | 203-674-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2010-08-25 | 203-349-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | WESTPORT | CT |
| 2010-07-28 | 203-681-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | BYRAM | CT |
| 2010-06-23 | 203-212-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2010-06-23 | 203-406-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2010-06-23 | 203-769-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | GREENWICH | CT |
| 2010-05-26 | 203-713-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | MILFORD | CT |
| 2009-08-20 | 203-529-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | WILTON | CT |
| 2008-06-27 | 203-939-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2008-03-13 | 203-275-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2008-03-13 | 203-388-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2008-02-07 | 203-517-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | CT |
| 2007-11-21 | 203-572-0XXX | 0000–0999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2007-11-09 | 203-293-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | WESTPORT | CT |
| 2007-10-17 | 203-990-0XXX | 0000–0999 | Assigned | CSC VOICE, LLC | 612K | OLDGRNWICH | CT |
| 2007-10-10 | 203-301-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | MILFORD | CT |
| 2007-10-10 | 203-873-0XXX | 0000–0999 | Assigned | CSC VOICE, LLC | 612K | BRIDGEPORT | CT |
| 2007-08-24 | 203-286-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2007-08-24 | 203-286-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2007-08-24 | 203-286-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | NORWALK | CT |
| 2007-08-24 | 203-504-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | STAMFORD | 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.