NumberResearchThousands-blocks in 551-385
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 551-385 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 551 blocks
Most active assignees, all time — NPA 551
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-02-02 | 551-385-0XXX | 0000–0999 | Assigned | ONVOY, LLC - NJ | 637C | WYCKOFF | NJ |
| 2024-05-14 | 551-385-1XXX | 1000–1999 | Assigned | ONVOY, LLC - NJ | 637C | WYCKOFF | NJ |
| — | 551-385-2XXX | 2000–2999 | Available | WYCKOFF | NJ | ||
| — | 551-385-3XXX | 3000–3999 | Available | WYCKOFF | NJ | ||
| — | 551-385-4XXX | 4000–4999 | Available | WYCKOFF | NJ | ||
| — | 551-385-5XXX | 5000–5999 | Available | WYCKOFF | NJ | ||
| 2023-11-09 | 551-385-6XXX | 6000–6999 | Assigned | CABLEVISION LIGHTPATH, INC. - NJ | 4948 | WYCKOFF | NJ |
| — | 551-385-7XXX | 7000–7999 | Available | WYCKOFF | NJ | ||
| — | 551-385-8XXX | 8000–8999 | Available | WYCKOFF | NJ | ||
| — | 551-385-9XXX | 9000–9999 | Available | WYCKOFF | NJ |
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.