NumberResearchThousands-blocks in 856-255
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 856-255 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2024-02-08 | 856-255-0XXX | 0000–0999 | Assigned | ONVOY, LLC - NJ | 637C | RIVERSIDE | NJ |
| 2007-04-09 | 856-255-1XXX | 1000–1999 | Assigned | PAETEC ITEL, LLC | 829J | RIVERSIDE | NJ |
| 2003-05-16 | 856-255-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - NJ | 7142 | RIVERSIDE | NJ |
| 2019-05-16 | 856-255-3XXX | 3000–3999 | Assigned | CORETEL NEW JERSEY, INC. - NJ | 482F | RIVERSIDE | NJ |
| 2019-05-16 | 856-255-4XXX | 4000–4999 | Assigned | CORETEL NEW JERSEY, INC. - NJ | 482F | RIVERSIDE | NJ |
| 2005-04-25 | 856-255-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | RIVERSIDE | NJ |
| 2019-05-16 | 856-255-6XXX | 6000–6999 | Assigned | CORETEL NEW JERSEY, INC. - NJ | 482F | RIVERSIDE | NJ |
| 2021-04-06 | 856-255-7XXX | 7000–7999 | Assigned | ONVOY SPECTRUM, LLC | 624H | RIVERSIDE | NJ |
| 2007-11-05 | 856-255-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | RIVERSIDE | NJ |
| — | 856-255-9XXX | 9000–9999 | Reserved | TELEPORT COMMUNICATIONS AMERICA, LLC - NJ | 7310 | RIVERSIDE | 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.