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 |
|---|---|---|---|---|---|---|
| 2004-10-25 | 336-868 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | GREENSBORO | NC |
| 2004-07-08 | 336-617 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | GREENSBORO | NC |
| 2004-04-01 | 336-289 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | HIGH POINT | NC |
| — | 336-201 | 1XXX2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | WINSTN SAL | NC |
| — | 336-217 | not yet reported which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | GREENSBORO | NC |
| — | 336-231 | 1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | WINSTN SAL | NC |
| — | 336-232 | 2XXX3XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | GREENSBORO | NC |
| — | 336-417 | 1XXX2XXX3XXX4XXX6XXX7XXX9XXX which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | BURLINGTON | NC |
| — | 336-423 | 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | KERNERSVL | NC |
| — | 336-458 | 6XXX7XXX8XXX which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | GREENSBORO | NC |
| — | 336-464 | 5XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | WINSTN SAL | NC |
| — | 336-678 | not yet reported which blocks → | LEVEL 3 TELECOM OF NORTH CAROLINA, LP - NC | 7973 | GREENSBORO | NC |
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.