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 |
|---|---|---|---|---|---|---|
| 2023-05-31 | 478-372 | 1XXX which blocks → | COMCAST IP PHONE, LLC | 318J | TWIN CITY | GA |
| 2022-12-20 | 478-340 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | FORSYTH | GA |
| 2021-12-08 | 478-350 | 1XXX2XXX · 2 holders which blocks → | COMCAST IP PHONE, LLC | 318J | BARTOW | GA |
| 2016-12-20 | 478-259 | 0–9 XXXall 10 · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MACON | GA |
| 2010-08-06 | 478-401 | 0–9 XXXall 10 · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MILLEN | GA |
| — | 478-254 | 0–9 XXXall 10 · 2 holders which blocks → | COMCAST IP PHONE, LLC | 318J | MACON | GA |
| — | 478-333 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | CENTERVL | GA |
| — | 478-359 | 3XXX4XXX6XXX · 2 holders which blocks → | COMCAST IP PHONE, LLC | 318J | LIZELLA | GA |
| — | 478-654 | 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | BYRON | GA |
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.