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 606
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-03-18 | 606-458-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | GRAYSON | KY |
| 2024-02-07 | 606-646-6XXX | 6000–6999 | Assigned | CSC VOICE, LLC | 612K | MEADS | KY |
| 2022-08-22 | 606-333-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | VIRGIE | KY |
| 2022-08-22 | 606-518-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | FEDSCREEK | KY |
| 2022-02-10 | 606-313-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | PIKEVILLE | KY |
| 2022-02-10 | 606-431-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | ELKHORN CY | KY |
| 2014-01-31 | 606-230-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | ALLEN | KY |
| 2014-01-31 | 606-257-1XXX | 1000–1999 | Assigned | CSC VOICE, LLC | 612K | SOWILLIMSN | KY |
| 2014-01-31 | 606-264-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | PAINTSVL | KY |
| 2014-01-31 | 606-390-2XXX | 2000–2999 | Assigned | CSC VOICE, LLC | 612K | WARFIELD | KY |
| 2014-01-31 | 606-519-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | STONE | KY |
| 2014-01-31 | 606-534-3XXX | 3000–3999 | Assigned | CSC VOICE, LLC | 612K | INEZ | KY |
| 2014-01-31 | 606-534-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | INEZ | 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 |
| 2008-10-27 | 606-259-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | ALLEN | KY |
| 2006-09-07 | 606-390-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | WARFIELD | KY |
| 2006-08-28 | 606-519-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | STONE | KY |
| 2006-08-18 | 606-257-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | SOWILLIMSN | KY |
| 2006-08-18 | 606-263-4XXX | 4000–4999 | Assigned | CSC VOICE, LLC | 612K | PRESTONSBG | KY |
| 2006-08-18 | 606-264-5XXX | 5000–5999 | Assigned | CSC VOICE, LLC | 612K | PAINTSVL | KY |
| 2006-08-18 | 606-534-7XXX | 7000–7999 | Assigned | CSC VOICE, LLC | 612K | INEZ | 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.