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 |
|---|---|---|---|---|---|---|
| 2004-08-05 | 905-418 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Thornhill | — |
| 2004-08-05 | 905-917 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Unionville | — |
| 2004-08-03 | 905-225 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | St. Catharines-Thorold | — |
| 2004-08-03 | 905-412 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Streetsville | — |
| 2004-07-30 | 905-215 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Oshawa | — |
| 2004-07-30 | 905-234 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Malton | — |
| 2004-07-29 | 905-247 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Cooksville | — |
| 2004-07-29 | 905-291 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Brampton | — |
| 2004-07-29 | 905-538 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Hamilton | — |
| 2002-08-02 | 905-364 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Malton | — |
| 2001-07-31 | 905-754 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Unionville | — |
| 2001-07-12 | 905-366 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Cooksville | — |
| 2001-01-08 | 905-443 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Oshawa | — |
| 2000-06-28 | 905-346 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | St. Catharines-Thorold | — |
| 2000-01-07 | 905-595 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Brampton | — |
| 2000-01-07 | 905-695 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Thornhill | — |
| — | 905-361 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Cooksville | — |
| — | 905-362 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Malton | — |
| — | 905-363 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Streetsville | — |
| — | 905-667 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Hamilton | — |
| — | 905-752 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Unionville | — |
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.