NumberResearchThousands-blocks in 606-263
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 606-263 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 606-263-0XXX | 0000–0999 | Reserved | POWERTEL KENTUCKY LICENSES, INC. | 365C | PRESTONSBG | KY |
| 2006-10-18 | 606-263-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | PRESTONSBG | KY |
| 2011-09-02 | 606-263-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | PRESTONSBG | KY |
| — | 606-263-3XXX | 3000–3999 | Available | PRESTONSBG | KY | ||
| 2006-08-18 | 606-263-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | PRESTONSBG | KY |
| 2013-01-28 | 606-263-5XXX | 5000–5999 | Assigned | BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL | 9419 | PRESTONSBG | KY |
| 2013-04-22 | 606-263-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - KY | 8406 | PRESTONSBG | KY |
| 2010-02-10 | 606-263-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | PRESTONSBG | KY |
| 2013-01-28 | 606-263-8XXX | 8000–8999 | Assigned | AT&T ENTERPRISES, LLC | 516C | PRESTONSBG | KY |
| — | 606-263-9XXX | 9000–9999 | Reserved | POWERTEL KENTUCKY LICENSES, INC. | 365C | PRESTONSBG | KY |
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.