NumberResearchRecent prefix assignments
1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 551-555 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | DIR ASST | NJ |
| — | 551-611 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NJ |
| — | 551-666 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - NJ | 637C | BAYONNE | NJ |
| — | 551-700 | not yet reported which blocks → | NJ | |||
| — | 551-711 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NJ |
| — | 551-777 | 0–9 XXXall 10 · 6 holders which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NJ | 6391 | RAMSEY | NJ |
| — | 551-800 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - NJ | 637C | WESTWOOD | NJ |
| — | 551-811 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NJ |
| — | 551-900 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLC - NJ | 637C | DUMONT | NJ |
| — | 551-911 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NJ |
| — | 551-950 | not yet reported which blocks → | NJ | |||
| — | 551-958 | not yet reported which blocks → | NJ | |||
| — | 551-959 | not yet reported which blocks → | NJ | |||
| — | 551-976 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | NJ |
| — | 551-999 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - NJ | 637C | HACKENSACK | NJ |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.