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 |
|---|---|---|---|---|---|---|
| 2025-03-21 | 316-270 | 0XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | HALSTEAD | KS |
| 2021-04-16 | 316-389 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | EL DORADO | KS |
| 2015-06-09 | 316-421 | 8XXX9XXX which blocks → | T-MOBILE USA, INC. | 6529 | TOWANDA | KS |
| 2014-06-17 | 316-227 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | NEWTON | KS |
| 2013-08-29 | 316-803 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | NEWTON | KS |
| 2006-11-16 | 316-435 | 0–9 XXXall 10 · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | EL DORADO | KS |
| 2006-11-16 | 316-587 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | NEWTON | KS |
| 2006-04-03 | 316-244 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | EL DORADO | KS |
| 2002-05-23 | 316-727 | 2XXX4XXX5XXX8XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | NEWTON | KS |
| — | 316-204 | 2XXX which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-207 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-208 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-209 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-210 | 0XXX2XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-214 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-288 | 2XXX which blocks → | T-MOBILE USA, INC. | 6529 | NEWTON | KS |
| — | 316-304 | 0XXX which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-308 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-371 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-377 | 1XXX2XXX5XXX8XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | EL DORADO | KS |
| — | 316-393 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-461 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-516 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-518 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-519 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-761 | 8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-990 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-992 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
| — | 316-993 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | WICHITA | KS |
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.