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 |
|---|---|---|---|---|---|---|
| — | 270-482 | 3XXX4XXX6XXX8XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | FRANKLIN | KY |
| — | 270-495 | 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | BOWLNGGREN | KY |
| — | 270-520 | none assigned yet which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | GRACEY | KY |
| — | 270-571 | 1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | RUSSELLVL | KY |
| — | 270-591 | none assigned yet which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | GUTHRIE | KY |
| — | 270-630 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | HAWESVILLE | KY |
| — | 270-631 | 5XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | HENDERSON | KY |
| — | 270-643 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | MADISONVL | KY |
| — | 270-645 | 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | OWENSBORO | KY |
| — | 270-656 | 1XXX2XXX3XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | MORGANTOWN | KY |
| — | 270-663 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | OWENSBORO | KY |
| — | 270-715 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | BOWLNGGREN | KY |
| — | 270-968 | not yet reported which blocks → | LEVEL 3 COMMUNICATIONS, LLC - KY | 4369 | BROWNSVL | KY |
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.