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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| — | 414-944 | 1XXX which blocks → | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | MILWAUKZN1 | WI |
| — | 414-950 | not yet reported which blocks → | WI | |||
| — | 414-955 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-958 | not yet reported which blocks → | MILWAUKZN1 | WI | ||
| — | 414-959 | not yet reported which blocks → | WI | |||
| — | 414-961 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-962 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-963 | 5XXX which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-964 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-967 | not yet reported which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN1 | WI |
| — | 414-973 | 0XXX1XXX2XXX8XXX9XXX · 3 holders which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | MILWAUKZN4 | WI |
| — | 414-975 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MILWAUKZN1 | WI |
| — | 414-976 | not yet reported which blocks → | MULTIPLE OCN LISTING | MULT | XXXXXXXXXX | WI |
| — | 414-977 | not yet reported which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | MILWAUKZN1 | WI |
| — | 414-978 | 7XXX which blocks → | TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | MILWAUKZN1 | WI |
| — | 414-979 | 0XXX1XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | WISCONSIN BELL INC | 9327 | MILWAUKZN4 | WI |
| — | 414-981 | not yet reported which blocks → | SPOK, INC. | 6630 | MILWAUKZN1 | 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.