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 281
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2014-06-18 | 281-608-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2014-06-18 | 281-706-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2014-06-18 | 281-713-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2014-04-01 | 281-601-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | PORTER | TX |
| 2014-01-30 | 281-503-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | PORTER HTS | TX |
| 2014-01-30 | 281-577-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | PORTER | TX |
| 2014-01-30 | 281-577-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | PORTER | TX |
| 2009-12-04 | 281-462-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | CROSBY | TX |
| 2009-07-16 | 281-399-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | SPLENDORA | TX |
| 2009-07-16 | 281-747-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | PORTER | TX |
| 2009-07-16 | 281-913-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2008-07-30 | 281-713-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2007-12-10 | 281-713-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2007-02-23 | 281-973-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | HUMBLE | TX |
| 2007-01-09 | 281-601-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | PORTER | TX |
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.