NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| 2017-05-03 | 937-250 | 0–9 XXXall 10 · 5 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | DAYTON | OH |
| 2014-03-27 | 937-856 | 0–9 XXXall 10 · 3 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | DAYTON | OH |
| 2011-08-08 | 937-702 | 0XXX1XXX3XXX4XXX7XXX9XXX · 6 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | BEAVERCREK | OH |
| 2010-06-25 | 937-705 | 0–9 XXXall 10 · 6 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | BEAVERCREK | OH |
| 2009-01-27 | 937-734 | 0–9 XXXall 10 · 2 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | DAYTON | OH |
| 2005-02-04 | 937-521 | 0–9 XXXall 10 · 6 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | SPRINGFLD | OH |
| 2002-09-20 | 937-665 | 2XXX8XXX9XXX · 2 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | VANDALIA | OH |
| 2002-09-11 | 937-247 | 0–9 XXXall 10 · 4 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | MSBGWCRLTN | OH |
| 2002-09-11 | 937-619 | 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | CENTERVLLE | OH |
| 2002-08-22 | 937-610 | 6XXX7XXX8XXX9XXX · 2 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | DAYTON | OH |
| — | 937-281 | not yet reported which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | DAYTON | OH |
| — | 937-535 | not yet reported which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | DAYTON | OH |
| — | 937-540 | 0–9 XXXall 10 · 7 holders which blocks → | CINCINNATI BELL EXTENDED TERRITORIES LLC - OH | 309B | ENGLEWOOD | OH |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.