NumberResearchThousands-blocks in 440-431
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 440-431 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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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-08-06 | 440-431-0XXX | 0000–0999 | Assigned | OHIO BELL TEL CO | 9321 | HILLCREST | OH |
| 2021-12-14 | 440-431-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | HILLCREST | OH |
| 2003-08-06 | 440-431-2XXX | 2000–2999 | Assigned | OHIO BELL TEL CO | 9321 | HILLCREST | OH |
| 2020-10-20 | 440-431-3XXX | 3000–3999 | Assigned | ONVOY, LLC - OH | 464C | HILLCREST | OH |
| 2020-10-20 | 440-431-4XXX | 4000–4999 | Assigned | ONVOY, LLC - OH | 464C | HILLCREST | OH |
| 2003-08-06 | 440-431-5XXX | 5000–5999 | Assigned | OHIO BELL TEL CO | 9321 | HILLCREST | OH |
| 2021-01-15 | 440-431-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HILLCREST | OH |
| 2021-01-15 | 440-431-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | HILLCREST | OH |
| 2021-01-15 | 440-431-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HILLCREST | OH |
| 2023-12-12 | 440-431-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HILLCREST | 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.