NumberResearchThousands-blocks in 606-506
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 606-506 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 606 blocks
Most active assignees, all time — NPA 606
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-09-08 | 606-506-0XXX | 0000–0999 | Assigned | ONVOY, LLC - KY | 896E | PRESTONSBG | KY |
| 2016-09-08 | 606-506-1XXX | 1000–1999 | Assigned | ONVOY, LLC - KY | 896E | PRESTONSBG | KY |
| 2021-07-06 | 606-506-2XXX | 2000–2999 | Assigned | POWERTEL KENTUCKY LICENSES, INC. | 365C | PRESTONSBG | KY |
| — | 606-506-3XXX | 3000–3999 | Available | PRESTONSBG | KY | ||
| 2013-11-01 | 606-506-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | PRESTONSBG | KY |
| 2013-11-01 | 606-506-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | PRESTONSBG | KY |
| 2021-07-06 | 606-506-6XXX | 6000–6999 | Assigned | POWERTEL KENTUCKY LICENSES, INC. | 365C | PRESTONSBG | KY |
| — | 606-506-7XXX | 7000–7999 | Available | PRESTONSBG | KY | ||
| 2020-06-19 | 606-506-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | PRESTONSBG | KY |
| 2019-02-22 | 606-506-9XXX | 9000–9999 | Assigned | POWERTEL KENTUCKY LICENSES, INC. | 365C | PRESTONSBG | KY |
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.