NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026
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 |
|---|---|---|---|---|---|---|
| 2009-03-19 | 304-800 | 0–9 XXXall 10 · 4 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | BLUEFIELD | WV |
| 2007-10-19 | 304-901 | 0–9 XXXall 10 · 6 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | MARTINSBG | WV |
| 2005-05-12 | 304-709 | 0–9 XXXall 10 · 5 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | CLARKSBURG | WV |
| 2005-05-12 | 304-982 | 0–9 XXXall 10 · 6 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | CHRLSTNZN1 | WV |
| 2004-08-20 | 304-309 | 0–9 XXXall 10 · 5 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | HINTON | WV |
| 2004-08-20 | 304-310 | 0–9 XXXall 10 · 8 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | CHAPMANVL | WV |
| 2003-11-24 | 304-391 | not yet reported which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | CHRLSTNZN1 | WV |
| 2003-11-24 | 304-423 | not yet reported which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | CLARKSBURG | WV |
| 2002-01-21 | 304-815 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | NEWMRTNSVL | WV |
| — | 304-554 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | CITYNET WEST VIRGINIA, LLC - WV | 545B | MORGANTOWN | WV |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.