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 |
|---|---|---|---|---|---|---|
| — | 720-373 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-394 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-453 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | LONGMONT | CO |
| — | 720-490 | 2XXX4XXX8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-581 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-641 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-732 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-761 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-771 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-837 | 1XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-838 | 1XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-839 | 2XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-840 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-841 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-849 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-933 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-934 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-935 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-936 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-937 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-938 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-939 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-940 | 0XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-971 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-979 | 0XXX1XXX2XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-980 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-982 | 0XXX1XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-984 | 0XXX1XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-985 | 0XXX1XXX2XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-987 | 0XXX1XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-988 | 1XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | CO |
| — | 720-989 | 0XXX1XXX2XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | DENVER | 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.