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 |
|---|---|---|---|---|---|---|
| 2005-03-14 | 586-222 | 0–9 XXXall 10 · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | ROSEVILLE | MI |
| 2001-02-15 | 586-365 | 1XXX7XXX8XXX9XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | WARREN | MI |
| — | 586-353 | 5XXX8XXX which blocks → | PAETEC ITEL, LLC | 829J | CENTERLINE | MI |
| — | 586-464 | 7XXX which blocks → | PAETEC ITEL, LLC | 829J | MT CLEMENS | MI |
| — | 586-541 | 8XXX which blocks → | PAETEC ITEL, LLC | 829J | ROSEVILLE | MI |
| — | 586-585 | 1XXX6XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | ROSEVILLE | MI |
| — | 586-619 | 1XXX3XXX4XXX7XXX8XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | CENTERLINE | MI |
| — | 586-684 | 1XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → | PAETEC ITEL, LLC | 829J | NEWBALTIMR | MI |
| — | 586-685 | 6XXX7XXX · 2 holders which blocks → | PAETEC ITEL, LLC | 829J | UTICA | MI |
| — | 586-698 | 2XXX7XXX8XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | WARREN | MI |
| — | 586-737 | 3XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → | PAETEC ITEL, LLC | 829J | UTICA | MI |
| — | 586-868 | 3XXX4XXX8XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | MT CLEMENS | MI |
| — | 586-960 | 3XXX4XXX5XXX6XXX9XXX · 3 holders which blocks → | PAETEC ITEL, LLC | 829J | ROMEO | MI |
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.