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 |
|---|---|---|---|---|---|---|
| 2025-05-23 | 608-980 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | REEDSBURG | WI |
| 2025-03-18 | 608-971 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | ELROY | WI |
| 2025-01-23 | 608-956 | 0XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | RICHLD CTR | WI |
| 2025-01-22 | 608-953 | 0XXX2XXX3XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LANCASTER | WI |
| 2025-01-22 | 608-954 | 0XXX1XXX2XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | MUSCODA | WI |
| 2025-01-21 | 608-951 | 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | GALESVILLE | WI |
| 2025-01-21 | 608-952 | 0XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | HOLMEN | WI |
| 2024-02-21 | 608-917 | 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | WISCONDLLS | WI |
| 2022-12-08 | 608-814 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| 2022-12-08 | 608-815 | 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | JANESVILLE | WI |
| 2021-06-28 | 608-706 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | TOMAH | WI |
| 2021-04-24 | 608-704 | 0XXX6XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | WEST SALEM | WI |
| 2018-10-31 | 608-901 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | JANESVILLE | WI |
| 2009-10-28 | 608-515 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | WI |
| 2008-01-29 | 608-351 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | WEST SALEM | WI |
| 2001-11-02 | 608-566 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | PORTAGE | WI |
| 2001-11-02 | 608-567 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | TOMAH | WI |
| 2001-08-03 | 608-448 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | BARABOO | WI |
| 2001-04-01 | 608-724 | 1XXX3XXX5XXX8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LA CROSSE | WI |
| 2001-02-05 | 608-658 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | WI |
| — | 608-207 | 1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| — | 608-209 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | WI |
| — | 608-213 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | WI |
| — | 608-217 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | WI |
| — | 608-239 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | WI |
| — | 608-359 | 0XXX2XXX4XXX7XXX8XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | JANESVILLE | WI |
| — | 608-385 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA CROSSE | WI |
| — | 608-707 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | MADISON | 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.