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 |
|---|---|---|---|---|---|---|
| — | 815-214 | 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | KANKAKEE | IL |
| — | 815-644 | 0XXX1XXX2XXX4XXX5XXX6XXX8XXX which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | CRESCENTCY | IL |
| — | 815-649 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | GARDNER | IL |
| — | 815-651 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | JOLIET | IL |
| — | 815-660 | 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | LOCKPORT | IL |
| — | 815-661 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | MORRIS | IL |
| — | 815-665 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | OTTAWA | IL |
| — | 815-679 | 4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | MCHENRY | IL |
| — | 815-680 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | MANHATTAN | IL |
| — | 815-687 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | WOODSTOCK | IL |
| — | 815-691 | 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | UTICA | IL |
| — | 815-733 | 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | PLAINFIELD | IL |
| — | 815-771 | 0XXX1XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | ASHKUM | IL |
| — | 815-781 | 1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | CHEBANSE | IL |
| — | 815-783 | 0XXX2XXX5XXX6XXX7XXX · 3 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | GILMAN | IL |
| — | 815-785 | 0XXX1XXX2XXX4XXX5XXX6XXX8XXX9XXX · 8 holders which blocks → | RCN TELECOM SERVICES OF ILLINIOS, INC. - IL | 8702 | WATSEKA | 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.