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 |
|---|---|---|---|---|---|---|
| 2002-02-21 | 209-275 | 1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | MANTECA | CA |
| 2002-02-21 | 209-277 | 1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | TURLOCK | CA |
| 2002-01-29 | 209-261 | 1XXX which blocks → | T-MOBILE USA, INC. | 6529 | MERCED | CA |
| 2001-12-26 | 209-200 | 1XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | LODI | CA |
| 2001-12-26 | 209-204 | 6XXX which blocks → | T-MOBILE USA, INC. | 6529 | MODESTO | CA |
| 2001-11-28 | 209-534 | 0XXX2XXX3XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | MODESTO | CA |
| 2001-09-19 | 209-298 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-233 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | MERCED | CA |
| — | 209-241 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | MODESTO | CA |
| — | 209-244 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-313 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-321 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | TRACY | CA |
| — | 209-345 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | MODESTO | CA |
| — | 209-490 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-518 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-564 | 3XXX4XXX5XXX which blocks → | T-MOBILE USA, INC. | 6529 | MERCED | CA |
| — | 209-649 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-670 | 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | STOCKTON | CA |
| — | 209-812 | 4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | ATWATER | CA |
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.