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 530
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-02-25 | 530-422-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | CLFX WEMR | CA |
| 2014-02-11 | 530-446-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | GRVY MAIN | CA |
| 2014-02-11 | 530-489-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | HOMEWOOD | CA |
| 2014-02-11 | 530-492-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | AUBN MAIN | CA |
| 2014-02-11 | 530-728-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | GRVY SOUTH | CA |
| 2014-02-03 | 530-412-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | NTAH THCY | CA |
| 2014-02-03 | 530-427-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | SODA SPG | CA |
| 2014-02-03 | 530-830-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | AUBN NORTH | CA |
| 2013-11-04 | 530-536-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | TRUCKEE | CA |
| 2013-11-04 | 530-536-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | TRUCKEE | CA |
| 2013-11-04 | 530-536-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | TRUCKEE | CA |
| 2012-08-03 | 530-562-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | TRUCKEE | CA |
| 2008-09-22 | 530-427-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | SODA SPG | CA |
| 2007-01-18 | 530-214-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | TRUCKEE | CA |
| 2007-01-18 | 530-278-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | GRVY SOUTH | CA |
| 2007-01-18 | 530-412-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | NTAH THCY | CA |
| 2007-01-18 | 530-525-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | HOMEWOOD | CA |
| 2007-01-18 | 530-575-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | GRVY MAIN | CA |
| 2007-01-18 | 530-637-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | CLFX WEMR | CA |
| 2006-12-29 | 530-392-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | AUBN MAIN | CA |
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.