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 |
|---|---|---|---|---|---|---|
| — | 641-322 | 1XXX2XXX7XXX8XXX9XXX · 4 holders which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | CORNING | IA |
| — | 641-333 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | LENOX | IA |
| — | 641-349 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | SHARPSBURG | IA |
| — | 641-358 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | MESERVEY | IA |
| — | 641-444 | 1XXX2XXX6XXX9XXX · 3 holders which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | BELMOND | IA |
| — | 641-495 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | GOODELL | IA |
| — | 641-579 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | LATIMER | IA |
| — | 641-692 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | ALEXANDER | IA |
| — | 641-853 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | ROWAN | IA |
| — | 641-866 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | COULTER | IA |
| — | 641-892 | 1XXX2XXX3XXX5XXX6XXX9XXX · 5 holders which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | SHEFFIELD | IA |
| — | 641-995 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | SWALEDALE | IA |
| — | 641-998 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF IOWA, INC. | 1127 | THORNTON | IA |
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.