NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026
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 |
|---|---|---|---|---|---|---|
| — | 509-737 | 4XXX7XXX · 2 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | KENNEWICK | WA |
| — | 509-745 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | DOUGLASCO | WA |
| — | 509-763 | 6XXX7XXX8XXX9XXX which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | WENATCHEE | WA |
| — | 509-775 | 1XXX4XXX6XXX7XXX · 3 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4423 | REPUBLIC | WA |
| — | 509-779 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4423 | CURLEW | WA |
| — | 509-782 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | WENATCHEE | WA |
| — | 509-783 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | KENNEWICK | WA |
| — | 509-784 | none assigned yet which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | WENATCHEE | WA |
| — | 509-785 | 0XXX1XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | GEORGE | WA |
| — | 509-787 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | QUINCY | WA |
| — | 509-872 | 0XXX2XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4321 | GARRISON | WA |
| — | 509-878 | 2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | PALOUSE | WA |
| — | 509-881 | 0XXX1XXX4XXX5XXX7XXX8XXX9XXX which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | WENATCHEE | WA |
| — | 509-884 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | WENATCHEE | WA |
| — | 509-886 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | WENATCHEE | WA |
| — | 509-942 | 4XXX5XXX8XXX9XXX · 2 holders which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | RICHLAND | WA |
| — | 509-943 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | RICHLAND | WA |
| — | 509-946 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | RICHLAND | WA |
| — | 509-967 | not yet reported which blocks → | ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER | 4324 | RICHLAND | WA |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.