NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/24/2026
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 |
|---|---|---|---|---|---|---|
| 2006-06-12 | 937-933 | 3XXX4XXX6XXX9XXX · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | TERREHAUTE | OH |
| 2005-03-08 | 937-714 | 2XXX3XXX7XXX which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | UNION CITY | OH |
| 2005-02-24 | 937-887 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | W LIBERTY | OH |
| 2005-02-15 | 937-662 | 0XXX7XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | ARCANUM | OH |
| 2005-02-14 | 937-810 | 0XXX1XXX3XXX5XXX7XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | RUSSELLSPT | OH |
| 2004-07-21 | 937-401 | 0–9 XXXall 10 · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | DAYTON | OH |
| 2003-11-11 | 937-648 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | DAYTON | OH |
| 2002-04-02 | 937-770 | 0–9 XXXall 10 · 7 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | BROOKVILLE | OH |
| — | 937-284 | 4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | SPRINGFLD | OH |
| — | 937-514 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | FRANKLIN | OH |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/24/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.