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 |
|---|---|---|---|---|---|---|
| 2011-08-19 | 608-336 | 0–9 XXXall 10 · 5 holders which blocks → | UTELCO, INC. | 0963 | MONROE | WI |
| — | 608-324 | not yet reported which blocks → | UTELCO, INC. | 0963 | MONROE | WI |
| — | 608-325 | not yet reported which blocks → | UTELCO, INC. | 0963 | MONROE | WI |
| — | 608-328 | not yet reported which blocks → | UTELCO, INC. | 0963 | MONROE | WI |
| — | 608-329 | not yet reported which blocks → | UTELCO, INC. | 0963 | MONROE | WI |
| — | 608-439 | 4XXX8XXX · 2 holders which blocks → | UTELCO, INC. | 0963 | SOUTHWAYNE | WI |
| — | 608-465 | 4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | UTELCO, INC. | 0963 | WOODFORD | WI |
| — | 608-523 | 2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → | UTELCO, INC. | 0963 | BLANCHADVL | WI |
| — | 608-862 | 7XXX8XXX · 2 holders which blocks → | UTELCO, INC. | 0963 | ALBANY | WI |
| — | 608-934 | 4XXX6XXX · 2 holders which blocks → | UTELCO, INC. | 0963 | JUDA | WI |
| — | 608-938 | 6XXX7XXX8XXX9XXX · 2 holders which blocks → | UTELCO, INC. | 0963 | MONTICELLO | WI |
| — | 608-966 | 5XXX8XXX9XXX · 2 holders which blocks → | UTELCO, INC. | 0963 | BROWNTOWN | WI |
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.