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 |
|---|---|---|---|---|---|---|
| 2007-02-21 | 330-840 | 0–9 XXXall 10 · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | TWINSBURG | OH |
| 2006-05-09 | 330-991 | 0–9 XXXall 10 · 4 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | DOYLESTOWN | OH |
| 2006-01-09 | 330-748 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | NORTHFIELD | OH |
| 2005-03-22 | 330-917 | 0–9 XXXall 10 · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | MARLBORO | OH |
| 2005-03-22 | 330-980 | 0–9 XXXall 10 · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | WARREN | OH |
| 2005-02-18 | 330-943 | 0XXX3XXX4XXX5XXX6XXX8XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | SHREVE | OH |
| 2005-01-25 | 330-520 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | MARSHALLVL | OH |
| 2004-12-01 | 330-642 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | ORRVILLE | OH |
| 2004-09-08 | 330-302 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | LODI | OH |
| 2004-09-08 | 330-331 | 0–9 XXXall 10 · 6 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | WADSWORTH | OH |
| 2003-11-10 | 330-622 | 0–9 XXXall 10 · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | AKRON | OH |
| 2003-08-12 | 330-397 | 0–9 XXXall 10 · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | YOUNGSTOWN | OH |
| 2001-05-22 | 330-485 | 0–9 XXXall 10 · 7 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7836 | RITTMAN | OH |
| — | 330-266 | 3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | NO CANTON | OH |
| — | 330-315 | not yet reported which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | AKRON | OH |
| — | 330-318 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | YOUNGSTOWN | OH |
| — | 330-437 | 5XXX6XXX7XXX8XXX9XXX which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | CANTON | OH |
| — | 330-598 | 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - OH | 7443 | MONTROSE | 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.