NumberResearchThousands-blocks in 330-576
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 330-576 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 330 blocks
Most active assignees, all time — NPA 330
New assignments by month
Sep 2026
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Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-09-01 | 330-576-0XXX | 0000–0999 | Assigned | ONVOY, LLC - OH | 464C | MONTROSE | OH |
| — | 330-576-1XXX | 1000–1999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | MONTROSE | OH |
| 2004-09-03 | 330-576-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | MONTROSE | OH |
| 2010-05-07 | 330-576-3XXX | 3000–3999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MONTROSE | OH |
| 2004-09-27 | 330-576-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | MONTROSE | OH |
| 2005-08-19 | 330-576-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | MONTROSE | OH |
| 2006-10-19 | 330-576-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MONTROSE | OH |
| 2014-05-02 | 330-576-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MONTROSE | OH |
| 2018-10-02 | 330-576-8XXX | 8000–8999 | Assigned | ONVOY, LLC - OH | 464C | MONTROSE | OH |
| 2013-08-28 | 330-576-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | MONTROSE | OH |
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.