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.
Most active assignees, all time — NPA 724
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2005-10-05 | 724-905 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CLYMER | PA |
| 2005-10-05 | 724-915 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | HOMER CITY | PA |
| 2005-05-12 | 724-901 | 0–9 XXXall 10 · 9 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | NEWWLMNGTN | PA |
| 2002-04-19 | 724-638 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | GREENVILLE | PA |
| 2001-07-06 | 724-602 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BUTLER | PA |
| 2001-06-15 | 724-574 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | VANDERGRFT | PA |
| 2001-05-03 | 724-318 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | AMBRIDGE | PA |
| 2001-05-03 | 724-359 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BEAVER FLS | PA |
| 2001-05-02 | 724-305 | 0XXX1XXX2XXX3XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | DONORA | PA |
| 2001-05-02 | 724-398 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | DAWSON | PA |
| 2001-05-02 | 724-560 | 0XXX1XXX3XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | FAYETTE CY | PA |
| 2001-05-02 | 724-908 | 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PERRYOPOLS | PA |
| 2001-03-12 | 724-382 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | PTGSBNZN23 | PA |
| 2001-01-29 | 724-268 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BELLEVRNON | PA |
| 2001-01-29 | 724-269 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MERCER | PA |
| 2001-01-29 | 724-364 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BROWNSVL | PA |
| 2001-01-29 | 724-473 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | ZELIENOPLE | PA |
| 2001-01-19 | 724-259 | 3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | LIGONIER | PA |
| 2001-01-19 | 724-519 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | EXPORT | PA |
| 2001-01-19 | 724-578 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | JEANNETTE | PA |
| 2001-01-19 | 724-597 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CANONSBURG | PA |
| 2001-01-19 | 724-613 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MTPLEASANT | PA |
| — | 724-207 | 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | WASHINGTON | PA |
| — | 724-216 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | GREENSBURG | PA |
| — | 724-240 | 0XXX3XXX6XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | AMBRIDGE | PA |
| — | 724-241 | 0XXX2XXX3XXX4XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BADEN | PA |
| — | 724-270 | 0XXX1XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | BESSEMER | PA |
| — | 724-271 | 0XXX1XXX3XXX6XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CANONSBURG | PA |
| — | 724-276 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | CHARLEROI | PA |
| — | 724-278 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | DONORA | PA |
| — | 724-289 | 0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | GREENSBURG | PA |
| — | 724-291 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | HERMINIE | PA |
| — | 724-293 | 0XXX3XXX4XXX5XXX6XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | IMPERIAL | PA |
| — | 724-296 | 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | JEANNETTE | PA |
| — | 724-299 | 1XXX3XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MCMURRAY | PA |
| — | 724-308 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | SHARON | PA |
| — | 724-362 | 0XXX3XXX4XXX6XXX7XXX8XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MONONGAHLA | PA |
| — | 724-365 | 3XXX6XXX7XXX8XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MTPLEASANT | PA |
| — | 724-367 | 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | NEWKNSNGTN | PA |
| — | 724-369 | 0XXX3XXX4XXX6XXX7XXX8XXX · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | OAKDALE | PA |
| — | 724-371 | 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | ROCHESTER | PA |
| — | 724-389 | 2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | TARENTUM | PA |
| — | 724-409 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | TARENTUM | PA |
| — | 724-415 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | UNIONTOWN | PA |
| — | 724-470 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | WASHINGTON | PA |
| — | 724-472 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | NEWKNSNGTN | PA |
| — | 724-498 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | NEW CASTLE | PA |
| — | 724-510 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | NEW CASTLE | PA |
| — | 724-572 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | LATROBE | PA |
| — | 724-576 | 0–9 XXXall 10 · 7 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - PA | 4007 | MIDLAND | PA |
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.