NumberResearchThousands-blocks in 856-603
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 856-603 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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 856-603-0XXX | 0000–0999 | Reserved | PAETEC ITEL, LLC | 829J | GLOUCESTER | NJ |
| 2026-01-14 | 856-603-1XXX | 1000–1999 | Assigned | ONVOY, LLC - NJ | 637C | GLOUCESTER | NJ |
| — | 856-603-2XXX | 2000–2999 | Reserved | PAETEC ITEL, LLC | 829J | GLOUCESTER | NJ |
| — | 856-603-3XXX | 3000–3999 | Reserved | PAETEC ITEL, LLC | 829J | GLOUCESTER | NJ |
| 2009-04-09 | 856-603-4XXX | 4000–4999 | Assigned | BLOCK LINE SYSTEMS, LLC - NJ | 835E | GLOUCESTER | NJ |
| 2025-09-18 | 856-603-5XXX | 5000–5999 | Assigned | ONVOY, LLC - NJ | 637C | GLOUCESTER | NJ |
| 2016-08-11 | 856-603-6XXX | 6000–6999 | Assigned | THE VOICE APPLICATION NETWORK, LLC | 507J | GLOUCESTER | NJ |
| 2018-11-08 | 856-603-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | GLOUCESTER | NJ |
| 2021-12-08 | 856-603-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | GLOUCESTER | NJ |
| — | 856-603-9XXX | 9000–9999 | Reserved | PAETEC ITEL, LLC | 829J | GLOUCESTER | 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.