NumberResearchRecent prefix assignments
1 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.
Most active assignees, last 30 days — NPA 414
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 414-288 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-289 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-290 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | MILWAUKZN1 | WI |
| — | 414-291 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-294 | 8XXX9XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-295 | 0–9 XXXall 10 · 5 holders which blocks → | METROPCS, INC. | 5562 | MILWAUKZN5 | WI |
| — | 414-297 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-298 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-299 | 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-302 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-303 | none assigned yet which blocks → | UNITED STATES CELLULAR - WI | 6274 | MILWAUKZN1 | WI |
| — | 414-304 | 4XXX5XXX8XXX9XXX · 3 holders which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN5 | WI |
| — | 414-305 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | MILWAUKZN1 | WI |
| — | 414-311 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | WI |
| — | 414-313 | none assigned yet which blocks → | UNITED STATES CELLULAR - WI | 6274 | MILWAUKZN1 | WI |
| — | 414-314 | not yet reported which blocks → | SPOK, INC. | 6630 | MILWAUKZN1 | WI |
| — | 414-315 | none assigned yet which blocks → | UNITED STATES CELLULAR - WI | 6274 | MILWAUKZN1 | WI |
| — | 414-318 | not yet reported which blocks → | AMERICAN MESSAGING SERVICES, LLC | 9748 | MILWAUKZN1 | WI |
| — | 414-319 | 9XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-320 | not yet reported which blocks → | SPOK, INC. | 6630 | MILWAUKZN1 | WI |
| — | 414-321 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-322 | none assigned yet which blocks → | UNITED STATES CELLULAR - WI | 6274 | MILWAUKZN1 | WI |
| — | 414-324 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | MILWAUKZN1 | WI |
| — | 414-325 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-327 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-328 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-329 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-330 | not yet reported which blocks → | SPOK, INC. | 6630 | MILWAUKZN1 | WI |
| — | 414-331 | not yet reported which blocks → | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | MILWAUKZN1 | WI |
| — | 414-332 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-333 | none assigned yet which blocks → | UNITED STATES CELLULAR - WI | 6274 | MILWAUKZN1 | WI |
| — | 414-336 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-337 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-338 | 0–9 XXXall 10 · 3 holders which blocks → | ONVOY, LLC - WI | 225C | MILWAUKZN1 | WI |
| — | 414-339 | not yet reported which blocks → | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MILWAUKZN1 | WI |
| — | 414-341 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-342 | 6XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-343 | 6XXX9XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-344 | 8XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-345 | 0XXX7XXX8XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-347 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-349 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MILWAUKZN1 | WI |
| — | 414-350 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MILWAUKZN1 | WI |
| — | 414-351 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-352 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-353 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-354 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-355 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-357 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-358 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | 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.