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 |
|---|---|---|---|---|---|---|
| 2012-02-06 | 740-540 | 0–9 XXXwhole prefix which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-626 | 0XXX8XXX9XXX · 3 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | BOURNEVL | OH |
| — | 740-634 | 0XXX8XXX9XXX · 3 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | BAINBDG | OH |
| — | 740-642 | 7XXX8XXX · 2 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | KINGSTON | OH |
| — | 740-655 | 4XXX5XXX6XXX8XXX · 4 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | HALLSVILLE | OH |
| — | 740-663 | 7XXX which blocks → | CHILLICOTHE TEL. CO. | 0597 | MASSIEVL | OH |
| — | 740-702 | not yet reported which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-772 | not yet reported which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-773 | not yet reported which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-774 | not yet reported which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-775 | not yet reported which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-779 | not yet reported which blocks → | CHILLICOTHE TEL. CO. | 0597 | CHILLICOTH | OH |
| — | 740-884 | 0XXX8XXX9XXX · 3 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | RICHMONDL | OH |
| — | 740-887 | 0XXX7XXX · 2 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | LONDONDRRY | OH |
| — | 740-993 | 0XXX1XXX3XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | CHILLICOTHE TEL. CO. | 0597 | CLARKSBURG | OH |
| — | 740-998 | 9XXX which blocks → | CHILLICOTHE TEL. CO. | 0597 | FRANKFORT | 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.