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 |
|---|---|---|---|---|---|---|
| 2006-08-25 | 815-250 | 0–9 XXXall 10 · 5 holders which blocks → | COMCAST IP PHONE, LLC | 318J | LA SALLE | IL |
| 2006-08-25 | 815-340 | 0XXX1XXX3XXX7XXX8XXX9XXX · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | LA MOILLE | IL |
| 2006-06-23 | 815-708 | 0–9 XXXall 10 · 4 holders which blocks → | COMCAST IP PHONE, LLC | 318J | ROCKFORD | IL |
| 2005-10-06 | 815-581 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | COMCAST IP PHONE, LLC | 318J | SPRING GRV | IL |
| 2005-02-14 | 815-901 | 0–9 XXXall 10 · 3 holders which blocks → | COMCAST IP PHONE, LLC | 318J | DE KALB | IL |
| 2004-12-30 | 815-893 | 0–9 XXXall 10 · 7 holders which blocks → | COMCAST IP PHONE, LLC | 318J | CRYSTAL LK | IL |
| 2004-10-14 | 815-390 | 0–9 XXXall 10 · 8 holders which blocks → | COMCAST IP PHONE, LLC | 318J | BRAIDWOOD | IL |
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.