NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 405
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 |
|---|---|---|---|---|---|---|---|
| 2022-02-18 | 405-991-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | LINDSAY | OK |
| 2021-09-24 | 405-874-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | NOBLE | OK |
| 2021-09-24 | 405-874-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | NOBLE | OK |
| 2021-09-24 | 405-955-0XXX | 0000–0999 | Assigned | CSC VOICE, LLC | 612K | PURCELL | OK |
| 2021-09-24 | 405-955-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | PURCELL | OK |
| 2021-09-24 | 405-955-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | PURCELL | OK |
| 2021-09-24 | 405-955-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | PURCELL | OK |
| 2021-09-24 | 405-955-8XXX | 8000–8999 | Assigned | CSC VOICE, LLC | 612K | PURCELL | OK |
| 2014-06-19 | 405-338-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | STILLWATER | OK |
| 2014-02-06 | 405-825-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | CHICKASHA | OK |
| 2014-02-06 | 405-939-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | PERKINS | OK |
| 2014-02-03 | 405-303-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | SEMINOLE | OK |
| 2014-02-03 | 405-331-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | PAULS VLY | OK |
| 2014-02-03 | 405-332-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | STILLWATER | OK |
| 2014-02-03 | 405-335-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | WYNNEWOOD | OK |
| 2014-02-03 | 405-337-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | WEWOKA | OK |
| 2014-02-03 | 405-337-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | WEWOKA | OK |
| 2010-06-08 | 405-564-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | STILLWATER | OK |
| 2006-12-07 | 405-220-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | SEMINOLE | OK |
| 2006-12-07 | 405-257-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | WEWOKA | OK |
| 2006-12-07 | 405-320-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | CHICKASHA | OK |
| 2006-08-17 | 405-547-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | PERKINS | OK |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.