NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026
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 |
|---|---|---|---|---|---|---|
| — | 309-293 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | ELLISVILLE | IL |
| — | 309-358 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | YATES CITY | IL |
| — | 309-484 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | ALTONA | IL |
| — | 309-639 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | WILLIMSFLD | IL |
| — | 309-758 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | TABLEGROVE | IL |
| — | 309-759 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | SUMMUM | IL |
| — | 309-778 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | FAIRVIEW | IL |
| — | 309-783 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | SMITHFIELD | IL |
| — | 309-875 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | MAQUON | IL |
| — | 309-876 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | GILSON | IL |
| — | 309-879 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | VICTORIA | IL |
| — | 309-926 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | MARIETTA | IL |
| — | 309-927 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | BISHOPHILL | IL |
| — | 309-995 | not yet reported which blocks → | MID CENTURY TEL. COOP., INC. | 1054 | LA FAYETTE | IL |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.