NumberResearchRecent prefix assignments
371 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/02/2026
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 |
|---|---|---|---|---|---|---|
| — | 989-979 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | ST JOHNS | MI |
| — | 989-981 | 1XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER NORTH, INC. - MI | 0695 | HUBBARDSTN | MI |
| — | 989-983 | 0XXX5XXX8XXX · 2 holders which blocks → | FRONTIER NORTH, INC. - MI | 0695 | VANDERBILT | MI |
| — | 989-984 | 4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | MICHIGAN BELL TEL CO | 9323 | EAST TAWAS | MI |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/02/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.