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 |
|---|---|---|---|---|---|---|
| 2002-10-16 | 309-466 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | ONVOY, LLC | 224C | EUREKA | IL |
| 2002-10-16 | 309-474 | 1XXX2XXX4XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLC | 224C | VARNA | IL |
| 2002-10-16 | 309-480 | 1XXX4XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLC | 224C | CASTLETON | IL |
| 2002-10-16 | 309-492 | 2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | ONVOY, LLC | 224C | CAMPGROVE | IL |
| 2002-10-16 | 309-580 | 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY, LLC | 224C | MOSSVILLE | IL |
| 2002-10-16 | 309-595 | 5XXX7XXX9XXX · 2 holders which blocks → | ONVOY, LLC | 224C | NEPONSET | IL |
| 2002-10-16 | 309-702 | 2XXX3XXX9XXX · 2 holders which blocks → | ONVOY, LLC | 224C | WYOMING | IL |
| 2002-10-16 | 309-741 | 1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → | ONVOY, LLC | 224C | ELMWOOD | IL |
| 2002-10-16 | 309-894 | 1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY, LLC | 224C | BUDA | IL |
| 2002-10-16 | 309-898 | 1XXX3XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLC | 224C | BRADFORD | IL |
| 2002-10-16 | 309-899 | 2XXX8XXX9XXX · 2 holders which blocks → | ONVOY, LLC | 224C | ELMIRA | IL |
| 2002-10-16 | 309-929 | 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY, LLC | 224C | TREMONT | IL |
| 2002-10-16 | 309-964 | 1XXX2XXX3XXX4XXX5XXX9XXX · 4 holders which blocks → | ONVOY, LLC | 224C | GOODFIELD | IL |
| — | 309-280 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC | 224C | PEORIA | IL |
| — | 309-312 | 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 5 holders which blocks → | ONVOY, LLC | 224C | KEWANEE | IL |
| — | 309-386 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLC | 224C | BLOOMINGTN | IL |
| — | 309-393 | 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → | ONVOY, LLC | 224C | BENSON | IL |
| — | 309-471 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | ONVOY, LLC | 224C | SPARLAND | IL |
| — | 309-568 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | ONVOY, LLC | 224C | ANDOVER | IL |
| — | 309-602 | 0XXX1XXX2XXX6XXX7XXX · 3 holders which blocks → | ONVOY, LLC | 224C | SHERRARD | IL |
| — | 309-617 | 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → | ONVOY, LLC | 224C | DUNLAP | IL |
| — | 309-921 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | ONVOY, LLC | 224C | ROANOKE | IL |
| — | 309-975 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → | ONVOY, LLC | 224C | AVON | IL |
| — | 309-988 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → | ONVOY, LLC | 224C | LACON | IL |
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.