NumberResearchThousands-blocks in 740-483
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 740-483 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 740 blocks
Most active assignees, all time — NPA 740
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-12-05 | 740-483-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | DUFFY | OH |
| — | 740-483-1XXX | 1000–1999 | Reserved | OHIO BELL TEL CO | 9321 | DUFFY | OH |
| — | 740-483-2XXX | 2000–2999 | Reserved | OHIO BELL TEL CO | 9321 | DUFFY | OH |
| 2015-06-08 | 740-483-3XXX | 3000–3999 | Assigned | ONVOY, LLC - OH | 464C | DUFFY | OH |
| — | 740-483-4XXX | 4000–4999 | Available | DUFFY | OH | ||
| 2011-09-23 | 740-483-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DUFFY | OH |
| 2023-06-28 | 740-483-6XXX | 6000–6999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | DUFFY | OH |
| 2021-01-12 | 740-483-7XXX | 7000–7999 | Assigned | AERIAL COMMUNICATIONS, INC. | 6701 | DUFFY | OH |
| 2024-01-08 | 740-483-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | DUFFY | OH |
| — | 740-483-9XXX | 9000–9999 | Reserved | OHIO BELL TEL CO | 9321 | DUFFY | 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.