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 |
|---|---|---|---|---|---|---|
| — | 509-651 | 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → | ONVOY, LLC - WA | 483E | DEER PARK | WA |
| — | 509-661 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | WENATCHEE | WA |
| — | 509-691 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-692 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-693 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-694 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-695 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-696 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-726 | none assigned yet which blocks → | ONVOY, LLC - WA | 483E | WENATCHEE | WA |
| — | 509-752 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-753 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-756 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-757 | not yet reported which blocks → | ONVOY, LLC - WA | 483E | SPOKANE | WA |
| — | 509-761 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLC - WA | 483E | MOSES LAKE | WA |
| — | 509-861 | 3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | ONVOY, LLC - WA | 483E | OMAK | WA |
| — | 509-870 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ONVOY, LLC - WA | 483E | KENNEWICK | WA |
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.