NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| — | 970-566 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-567 | 8XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-581 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-584 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | GREELEY | CO |
| — | 970-689 | 3XXX which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-690 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-691 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-692 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-701 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | CRAIG | CO |
| — | 970-710 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | ASPEN | CO |
| — | 970-904 | 2XXX5XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | VAIL | CO |
| — | 970-914 | 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | VAIL | CO |
| — | 970-930 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | GLENWD SPG | CO |
| — | 970-977 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | VAIL | CO |
| — | 970-978 | 2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | GREELEY | CO |
| — | 970-980 | 0XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-985 | 1XXX2XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | GRAND JCT | CO |
| — | 970-986 | 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | GRAND JCT | CO |
| — | 970-988 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | FT COLLINS | CO |
| — | 970-989 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | GLENWD SPG | CO |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.