NumberResearchThousands-blocks in 856-553
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 856-553 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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-01-28 | 856-553-0XXX | 0000–0999 | Assigned | ONVOY, LLC - NJ | 637C | PITMAN | NJ |
| 2016-01-28 | 856-553-1XXX | 1000–1999 | Assigned | ONVOY, LLC - NJ | 637C | PITMAN | NJ |
| 2009-01-06 | 856-553-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PITMAN | NJ |
| 2009-01-06 | 856-553-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - DC | 4036 | PITMAN | NJ |
| 2008-05-22 | 856-553-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NJ | 7134 | PITMAN | NJ |
| 2010-01-27 | 856-553-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | PITMAN | NJ |
| 2007-02-09 | 856-553-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | PITMAN | NJ |
| 2010-08-06 | 856-553-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | PITMAN | NJ |
| 2011-02-03 | 856-553-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - NJ | 118F | PITMAN | NJ |
| 2017-08-22 | 856-553-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | PITMAN | 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.