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 |
|---|---|---|---|---|---|---|
| 2018-06-06 | 256-742 | 0XXX1XXX2XXX6XXX8XXX9XXX · 3 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | ELKMONT | AL |
| 2018-01-31 | 256-681 | 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | MORGANCITY | AL |
| 2018-01-31 | 256-752 | 0XXX1XXX3XXX6XXX7XXX9XXX · 4 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | UNIONGROVE | AL |
| 2017-12-20 | 256-421 | 0XXX1XXX · 2 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | GRANT | AL |
| 2007-08-28 | 256-686 | 0–9 XXXall 10 · 5 holders which blocks → | CHARTER IP ENABLED SERVICES, LLC | 792K | DECATUR | AL |
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.