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 |
|---|---|---|---|---|---|---|
| 2014-08-12 | 567-402 | 0–9 XXXall 10 · 4 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | MAUMEE | OH |
| 2014-03-27 | 567-407 | 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | PLYMOUTH | OH |
| 2014-03-27 | 567-423 | 0–9 XXXall 10 · 8 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | PERRYSVL | OH |
| 2014-03-25 | 567-352 | 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | HASKISTGNY | OH |
| 2014-03-25 | 567-612 | 0–9 XXXall 10 · 2 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | GREEN SPG | OH |
| 2014-03-25 | 567-706 | 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | MONROEVL | OH |
| 2013-11-14 | 567-701 | 7XXX which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | NAPOLEON | OH |
| 2013-05-16 | 567-309 | 0–9 XXXall 10 · 4 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | MANSFIELD | OH |
| 2013-03-27 | 567-418 | 0–9 XXXall 10 · 2 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | LIMA | OH |
| — | 567-321 | 0–9 XXXall 10 · 7 holders which blocks → | CENTURYLINK COMMUNICATIONS, LLC | 508J | NEWWSHNGTN | 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.