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 |
|---|---|---|---|---|---|---|
| 2023-07-26 | 248-810 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLCV - MI | 543C | ROYAL OAK | MI |
| 2016-11-30 | 248-900 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLCV - MI | 543C | ORTONVILLE | MI |
| 2016-06-30 | 248-983 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLCV - MI | 543C | HOLLY | MI |
| 2015-09-04 | 248-951 | 0–9 XXXall 10 · 6 holders which blocks → | ONVOY, LLCV - MI | 543C | ROYAL OAK | MI |
| 2015-08-17 | 248-600 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLCV - MI | 543C | PONTIAC | MI |
| 2015-04-01 | 248-800 | 0–9 XXXall 10 · 4 holders which blocks → | ONVOY, LLCV - MI | 543C | OXFORD | MI |
| 2004-07-09 | 248-794 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLCV - MI | 543C | SOUTHFIELD | MI |
| — | 248-509 | 0–9 XXXall 10 · 5 holders which blocks → | ONVOY, LLCV - MI | 543C | TROY | MI |
| — | 248-780 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLCV - MI | 543C | HOLLY | MI |
| — | 248-801 | 0–9 XXXall 10 · 2 holders which blocks → | ONVOY, LLCV - MI | 543C | W BLOOMFLD | MI |
| — | 248-919 | 2XXX4XXX5XXX7XXX8XXX · 3 holders which blocks → | ONVOY, LLCV - MI | 543C | FARMINGTON | 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.