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 |
|---|---|---|---|---|---|---|
| 2014-02-26 | 937-762 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| 2012-07-25 | 937-713 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| 2008-07-17 | 937-487 | 0–9 XXXwhole prefix which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| 2005-03-23 | 937-723 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| 2003-12-11 | 937-481 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | WILMINGTON | OH |
| 2002-07-29 | 937-576 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | VANDALIA | OH |
| 2002-05-15 | 937-550 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | FRANKLIN | OH |
| 2001-12-26 | 937-531 | 1XXX7XXX8XXX9XXX which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| — | 937-255 | not yet reported which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| — | 937-257 | not yet reported which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| — | 937-425 | not yet reported which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| — | 937-490 | 1XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | BEAVERCREK | OH |
| — | 937-560 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | MSBGWCRLTN | OH |
| — | 937-656 | not yet reported which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
| — | 937-874 | 1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | FAIRBORN | OH |
| — | 937-904 | not yet reported which blocks → | LEVEL 3 TELECOM OF OHIO, LLC - OH | 7460 | DAYTON | OH |
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.