NumberResearchThousands-blocks in 856-373
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 856-373 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2003-10-10 | 856-373-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
| 2003-10-10 | 856-373-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
| 2003-12-08 | 856-373-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
| 2003-12-08 | 856-373-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
| 2015-07-15 | 856-373-4XXX | 4000–4999 | Assigned | ONVOY, LLC - NJ | 637C | BLACKWOOD | NJ |
| 2016-09-09 | 856-373-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | BLACKWOOD | NJ |
| 2004-01-15 | 856-373-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
| 2022-02-18 | 856-373-7XXX | 7000–7999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | BLACKWOOD | NJ |
| 2004-01-15 | 856-373-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
| 2021-12-14 | 856-373-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | BLACKWOOD | NJ |
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.