NumberResearchThousands-blocks in 856-450
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 856-450 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 856 blocks
Most active assignees, all time — NPA 856
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-09-18 | 856-450-0XXX | 0000–0999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | BEAVER BRK | NJ |
| 2019-03-04 | 856-450-1XXX | 1000–1999 | Assigned | EXIANT COMMUNICATIONS LLC | 114J | BEAVER BRK | NJ |
| 2022-01-19 | 856-450-2XXX | 2000–2999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BEAVER BRK | NJ |
| 2022-01-19 | 856-450-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BEAVER BRK | NJ |
| 2025-09-04 | 856-450-4XXX | 4000–4999 | Assigned | ONVOY, LLC - NJ | 637C | BEAVER BRK | NJ |
| 2021-04-05 | 856-450-5XXX | 5000–5999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BEAVER BRK | NJ |
| 2023-04-24 | 856-450-6XXX | 6000–6999 | Assigned | ONVOY, LLC - NJ | 637C | BEAVER BRK | NJ |
| 2020-04-14 | 856-450-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | BEAVER BRK | NJ |
| 2020-04-14 | 856-450-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | BEAVER BRK | NJ |
| 2023-05-02 | 856-450-9XXX | 9000–9999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | BEAVER BRK | 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.