NumberResearchRecent prefix assignments
0 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 |
|---|---|---|---|---|---|---|
| — | 503-861 | 8XXX which blocks → | QWEST CORPORATION | 9638 | WARRENTON | OR |
| — | 503-865 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-872 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-886 | 8XXX9XXX · 2 holders which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-892 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-909 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-916 | 9XXX which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-944 | 9XXX which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-945 | not yet reported which blocks → | QWEST CORPORATION | 9638 | SALEM | OR |
| — | 503-947 | not yet reported which blocks → | QWEST CORPORATION | 9638 | SALEM | OR |
| — | 503-948 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-952 | 6XXX which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-962 | 0XXX9XXX which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-963 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-973 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-977 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-978 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
| — | 503-980 | 1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | QWEST CORPORATION | 9638 | WOODBURN | OR |
| — | 503-981 | not yet reported which blocks → | QWEST CORPORATION | 9638 | WOODBURN | OR |
| — | 503-982 | not yet reported which blocks → | QWEST CORPORATION | 9638 | WOODBURN | OR |
| — | 503-986 | not yet reported which blocks → | QWEST CORPORATION | 9638 | SALEM | OR |
| — | 503-988 | not yet reported which blocks → | QWEST CORPORATION | 9638 | PORTLAND | OR |
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.