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 |
|---|---|---|---|---|---|---|
| 2010-12-28 | 845-655 | 0–9 XXXall 10 · 7 holders which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONROE | NY |
| 2001-07-23 | 845-460 | 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 3 holders which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | HIGHLANDML | NY |
| 2001-07-23 | 845-572 | 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | CHESTER | NY |
| 2001-02-02 | 845-492 | 0XXX6XXX7XXX9XXX which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONROE | NY |
| — | 845-291 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | GOSHEN | NY |
| — | 845-294 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | GOSHEN | NY |
| — | 845-427 | 1XXX which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MAYBROOK | NY |
| — | 845-457 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONTGOMERY | NY |
| — | 845-469 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | CHESTER | NY |
| — | 845-496 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | WASHIGTNVL | NY |
| — | 845-497 | 6XXX which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | WASHIGTNVL | NY |
| — | 845-615 | 4XXX7XXX9XXX · 3 holders which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | GOSHEN | NY |
| — | 845-744 | 0XXX which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | PINE BUSH | NY |
| — | 845-774 | none assigned yet which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONROE | NY |
| — | 845-778 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | WALDEN | NY |
| — | 845-781 | none assigned yet which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONROE | NY |
| — | 845-782 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONROE | NY |
| — | 845-783 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | MONROE | NY |
| — | 845-895 | none assigned yet which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | WALLKILL | NY |
| — | 845-928 | not yet reported which blocks → | FRONTIER COMMUNICATIONS OF NEW YORK, INC. | 0100 | HIGHLANDML | NY |
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.