NumberResearchThousands-blocks in 331-283
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 331-283 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 331 blocks
Most active assignees, all time — NPA 331
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
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Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-02-08 | 331-283-0XXX | 0000–0999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2025-08-14 | 331-283-1XXX | 1000–1999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2025-10-02 | 331-283-2XXX | 2000–2999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2024-04-26 | 331-283-3XXX | 3000–3999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GENEVA | IL |
| 2022-11-02 | 331-283-4XXX | 4000–4999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2025-12-12 | 331-283-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2026-01-27 | 331-283-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| — | 331-283-7XXX | 7000–7999 | Available | GENEVA | IL | ||
| 2026-04-16 | 331-283-8XXX | 8000–8999 | Assigned | ONVOY, LLC | 224C | GENEVA | IL |
| 2022-02-23 | 331-283-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | GENEVA | IL |
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.