NumberResearchThousands-blocks in 440-578
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 440-578 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 440 blocks
Most active assignees, all time — NPA 440
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 |
|---|---|---|---|---|---|---|---|
| 2019-12-11 | 440-578-0XXX | 0000–0999 | Assigned | ONVOY, LLC - OH | 464C | MENTOR | OH |
| — | 440-578-1XXX | 1000–1999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | MENTOR | OH |
| 2009-11-04 | 440-578-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | MENTOR | OH |
| 2022-08-01 | 440-578-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - OH | 7532 | MENTOR | OH |
| 2026-04-14 | 440-578-4XXX | 4000–4999 | Assigned | ONVOY, LLC - OH | 464C | MENTOR | OH |
| 2008-05-21 | 440-578-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | MENTOR | OH |
| — | 440-578-6XXX | 6000–6999 | Reserved | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | MENTOR | OH |
| 2019-12-11 | 440-578-7XXX | 7000–7999 | Assigned | ONVOY, LLC - OH | 464C | MENTOR | OH |
| 2018-06-15 | 440-578-8XXX | 8000–8999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | MENTOR | OH |
| 2018-01-30 | 440-578-9XXX | 9000–9999 | Assigned | ONVOY, LLC - OH | 464C | MENTOR | 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.