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 |
|---|---|---|---|---|---|---|
| 2012-07-09 | 256-336 | 0–9 XXXwhole prefix which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| 2006-05-10 | 256-799 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 327A | HUNTSVILLE | AL |
| 2003-05-21 | 256-615 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | CULLMAN | AL |
| 2003-05-21 | 256-616 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | DECATUR | AL |
| 2002-08-27 | 256-450 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| 2002-02-19 | 256-469 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-313 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-319 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | MADISON | AL |
| — | 256-327 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-428 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-704 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-705 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-730 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-842 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-876 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | AL |
| — | 256-955 | not yet reported which blocks → | CENTURYLINK COMMUNICATIONS LLC - AL | 7451 | HUNTSVILLE | 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.