NumberResearchThousands-blocks in 440-399
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 440-399 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
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2008-01-29 | 440-399-0XXX | 0000–0999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | BEDFORD | OH |
| — | 440-399-1XXX | 1000–1999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | BEDFORD | OH |
| — | 440-399-2XXX | 2000–2999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - OH | 4863 | BEDFORD | OH |
| — | 440-399-3XXX | 3000–3999 | Available | BEDFORD | OH | ||
| 2024-02-12 | 440-399-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | BEDFORD | OH |
| — | 440-399-5XXX | 5000–5999 | Available | BEDFORD | OH | ||
| 2023-08-01 | 440-399-6XXX | 6000–6999 | Assigned | ONVOY, LLC - OH | 464C | BEDFORD | OH |
| 2010-01-20 | 440-399-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - OH | 001F | BEDFORD | OH |
| 2014-03-04 | 440-399-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BEDFORD | OH |
| — | 440-399-9XXX | 9000–9999 | Available | BEDFORD | 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.