NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2018-08-24 | 330-443 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX which blocks → | ONVOY, LLC - OH | 464C | HARTFORD | OH |
| 2012-01-13 | 330-616 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC - OH | 464C | NO CANTON | OH |
| 2008-01-03 | 330-406 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLC - OH | 464C | YOUNGSTOWN | OH |
| — | 330-237 | not yet reported which blocks → | ONVOY, LLC - OH | 464C | AKRON | OH |
| — | 330-294 | 0XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → | ONVOY, LLC - OH | 464C | AKRON | OH |
| — | 330-551 | 0–9 XXXall 10 · 8 holders which blocks → | ONVOY, LLC - OH | 464C | HARTVILLE | OH |
| — | 330-961 | 0–9 XXXall 10 · 8 holders which blocks → | ONVOY, LLC - OH | 464C | UNIONTOWN | OH |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.