NumberResearchThousands-blocks in 856-306
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 856-306 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
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 856-306-0XXX | 0000–0999 | Reserved | PAETEC ITEL, LLC | 829J | BERLIN | NJ |
| — | 856-306-1XXX | 1000–1999 | Reserved | PAETEC ITEL, LLC | 829J | BERLIN | NJ |
| 2004-02-25 | 856-306-2XXX | 2000–2999 | Assigned | MONMOUTH TELEPHONE AND TELEGRAPH, INC. - NJ | 3639 | BERLIN | NJ |
| — | 856-306-3XXX | 3000–3999 | Reserved | PAETEC ITEL, LLC | 829J | BERLIN | NJ |
| — | 856-306-4XXX | 4000–4999 | Reserved | PAETEC ITEL, LLC | 829J | BERLIN | NJ |
| 2008-01-21 | 856-306-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | BERLIN | NJ |
| — | 856-306-6XXX | 6000–6999 | Reserved | PAETEC ITEL, LLC | 829J | BERLIN | NJ |
| 2020-04-07 | 856-306-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | BERLIN | NJ |
| 2007-03-16 | 856-306-8XXX | 8000–8999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ | 7134 | BERLIN | NJ |
| — | 856-306-9XXX | 9000–9999 | Reserved | PAETEC ITEL, LLC | 829J | BERLIN | 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.