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 |
|---|---|---|---|---|---|---|
| 2022-04-28 | 304-718 | 0XXX1XXX2XXX3XXX4XXX5XXX · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | ROWLESBURG | WV |
| 2009-02-17 | 304-213 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | WORTHINGTN | WV |
| 2008-07-30 | 304-708 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | MT MORRIS | WV |
| 2005-10-10 | 304-909 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → | COMCAST IP PHONE, LLC | 318J | WHELNGZON3 | WV |
| 2005-04-14 | 304-810 | 0–9 XXXall 10 · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | WHELNGZON5 | WV |
| 2005-04-12 | 304-905 | 0–9 XXXall 10 · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | WHELNGZON1 | WV |
| — | 304-378 | not yet reported which blocks → | COMCAST IP PHONE, LLC | 318J | MARTINSBG | 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.