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 |
|---|---|---|---|---|---|---|
| 2011-11-21 | 304-362 | 0–9 XXXall 10 · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | BECKLEY | WV |
| 2008-02-06 | 304-356 | 0–9 XXXall 10 · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| 2002-02-22 | 304-952 | 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | BLUEFIELD | WV |
| 2001-09-20 | 304-444 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| 2001-06-12 | 304-512 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → | T-MOBILE USA, INC. | 6529 | RAVENSWOOD | WV |
| 2001-06-12 | 304-731 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | BECKLEY | WV |
| 2001-06-12 | 304-741 | 4XXX5XXX8XXX9XXX · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| 2001-06-12 | 304-751 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | HNTNGTNZN1 | WV |
| 2001-06-12 | 304-834 | 1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 4 holders which blocks → | T-MOBILE USA, INC. | 6529 | PRKRSBGZN1 | WV |
| 2001-04-16 | 304-395 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| — | 304-200 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | WILLIAMSTN | WV |
| — | 304-222 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | BECKLEY | WV |
| — | 304-237 | 0XXX2XXX which blocks → | T-MOBILE USA, INC. | 6529 | BECKLEY | WV |
| — | 304-412 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | HNTNGTNZN1 | WV |
| — | 304-415 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| — | 304-416 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | HNTNGTNZN1 | WV |
| — | 304-417 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | HNTNGTNZN1 | WV |
| — | 304-419 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| — | 304-421 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| — | 304-437 | 7XXX which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| — | 304-440 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | T-MOBILE USA, INC. | 6529 | RAVENSWOOD | WV |
| — | 304-610 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | CHRLSTNZN1 | WV |
| — | 304-615 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | PRKRSBGZN1 | WV |
| — | 304-617 | none assigned yet which blocks → | T-MOBILE USA, INC. | 6529 | HNTNGTNZN1 | WV |
| — | 304-812 | 0–9 XXXall 10 · 5 holders which blocks → | T-MOBILE USA, INC. | 6529 | PTPLEASANT | WV |
| — | 304-910 | 0–9 XXXall 10 · 2 holders which blocks → | T-MOBILE USA, INC. | 6529 | BLUEFIELD | WV |
| — | 304-922 | 3XXX4XXX5XXX6XXX · 3 holders which blocks → | T-MOBILE USA, INC. | 6529 | BLUEFIELD | WV |
| — | 304-955 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | T-MOBILE USA, INC. | 6529 | HNTNGTNZN2 | WV |
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.