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 |
|---|---|---|---|---|---|---|
| 2005-07-01 | 567-303 | 0–9 XXXall 10 · 5 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | MANSFIELD | OH |
| 2004-04-27 | 567-371 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | LIMA | OH |
| 2003-01-27 | 567-276 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | BRYAN | OH |
| 2003-01-27 | 567-279 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | CELINA | OH |
| 2002-11-13 | 567-259 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | VAN WERT | OH |
| 2002-11-13 | 567-264 | 3XXX4XXX7XXX · 3 holders which blocks → | TIER 2 COMMUNICATIONS, LLC | 8168 | NAPOLEON | 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.