NumberResearchThousands-blocks in 330-921
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 330-921 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-04-23 | 330-921-0XXX | 0000–0999 | Assigned | ONVOY, LLC - OH | 464C | COLUMBIANA | OH |
| — | 330-921-1XXX | 1000–1999 | Reserved | T-MOBILE USA, INC. | 6529 | COLUMBIANA | OH |
| 2016-06-22 | 330-921-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | COLUMBIANA | OH |
| 2019-04-23 | 330-921-3XXX | 3000–3999 | Assigned | ONVOY, LLC - OH | 464C | COLUMBIANA | OH |
| 2005-03-02 | 330-921-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | COLUMBIANA | OH |
| 2006-07-26 | 330-921-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | COLUMBIANA | OH |
| 2014-02-20 | 330-921-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | COLUMBIANA | OH |
| 2012-06-06 | 330-921-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | COLUMBIANA | OH |
| 2004-11-29 | 330-921-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | COLUMBIANA | OH |
| — | 330-921-9XXX | 9000–9999 | Reserved | T-MOBILE USA, INC. | 6529 | COLUMBIANA | OH |
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.