NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| — | 708-369 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-372 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | SUMMIT | IL |
| — | 708-415 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-417 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | NORTHBROOK | IL |
| — | 708-466 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-473 | 3XXX which blocks → | T-MOBILE USA, INC. | 6529 | BLUEISLAND | IL |
| — | 708-514 | 9XXX which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-539 | 0–9 XXXwhole prefix which blocks → | T-MOBILE USA, INC. | 6529 | CHICAGOHTS | IL |
| — | 708-574 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-612 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-646 | 0XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-655 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-692 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-705 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-715 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-774 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | NORTHBROOK | IL |
| — | 708-785 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-829 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-878 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-906 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
| — | 708-913 | 0–9 XXXall 10 · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | HARVEY | IL |
| — | 708-955 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LA GRANGE | IL |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.