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 |
|---|---|---|---|---|---|---|
| 2015-04-10 | 213-343 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| 2015-04-10 | 213-354 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| 2015-03-11 | 213-357 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 10 | CA |
| 2014-10-02 | 213-326 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| 2006-10-26 | 213-245 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 07 | CA |
| 2005-11-01 | 213-822 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| 2002-05-15 | 213-675 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 07 | CA |
| 2002-05-15 | 213-820 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 10 | CA |
| 2002-02-11 | 213-210 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 10 | CA |
| 2001-09-14 | 213-272 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 07 | CA |
| 2001-09-11 | 213-268 | not yet reported which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-255 | 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 07 | CA |
| — | 213-258 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-265 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-274 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-344 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-539 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-804 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | CA |
| — | 213-905 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 07 | CA |
| — | 213-921 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | LSAN DA 01 | 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.