NumberResearchThousands-blocks in 856-437
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 856-437 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 |
|---|---|---|---|---|---|---|---|
| 2008-11-05 | 856-437-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | MOORESTOWN | NJ |
| — | 856-437-1XXX | 1000–1999 | Reserved | AT&T - LOCAL | 7421 | MOORESTOWN | NJ |
| — | 856-437-2XXX | 2000–2999 | Reserved | AT&T - LOCAL | 7421 | MOORESTOWN | NJ |
| 2014-03-19 | 856-437-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ | 7134 | MOORESTOWN | NJ |
| 2005-02-22 | 856-437-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | MOORESTOWN | NJ |
| 2005-02-22 | 856-437-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - NJ | 4804 | MOORESTOWN | NJ |
| 2006-09-01 | 856-437-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | MOORESTOWN | NJ |
| 2007-05-09 | 856-437-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ | 7134 | MOORESTOWN | NJ |
| 2006-09-28 | 856-437-8XXX | 8000–8999 | Assigned | PAETEC ITEL, LLC | 829J | MOORESTOWN | NJ |
| 2009-09-10 | 856-437-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | MOORESTOWN | 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.