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 |
|---|---|---|---|---|---|---|
| — | 708-746 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | MONEE | IL |
| — | 708-752 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | BLUEISLAND | IL |
| — | 708-782 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CALUMET CY | IL |
| — | 708-794 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | HOMEWOOD | IL |
| — | 708-808 | 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CALUMET CY | IL |
| — | 708-810 | 0XXX1XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | BEECHER | IL |
| — | 708-813 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | LA GRANGE | IL |
| — | 708-820 | 1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | BROOKFIELD | IL |
| — | 708-838 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | MAYWOOD | IL |
| — | 708-871 | 0XXX1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | RIVERSIDE | IL |
| — | 708-876 | 4XXX6XXX9XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | OAK LAWN | IL |
| — | 708-910 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | SUMMIT | IL |
| — | 708-934 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | OAK PARK | IL |
| — | 708-943 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | CICERO | IL |
| — | 708-954 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - IL | 6115 | BLUEISLAND | IL |
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.