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 |
|---|---|---|---|---|---|---|
| 2014-08-22 | 289-502 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Thornhill | — |
| 2014-08-21 | 289-406 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Brampton | — |
| 2013-06-27 | 289-454 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Cooksville | — |
| 2013-06-27 | 289-457 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Streetsville | — |
| 2012-06-19 | 289-451 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Markham | — |
| 2012-06-19 | 289-452 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Richmond Hill | — |
| 2012-06-19 | 289-453 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Newmarket | — |
| 2011-07-06 | 289-667 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Hamilton | — |
| 2009-08-27 | 289-374 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Cooksville | — |
| 2008-10-02 | 289-695 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Thornhill | — |
| 2008-05-08 | 289-449 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Welland | — |
| 2008-05-08 | 289-450 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Ancaster | — |
| 2008-02-20 | 289-765 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Stoney Creek | — |
| 2007-05-23 | 289-371 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Woodbridge | — |
| 2007-05-23 | 289-372 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Ajax-Pickering | — |
| 2007-05-23 | 289-373 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Clarkson | — |
| 2006-06-27 | 289-369 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Dunnville | — |
| 2006-06-27 | 289-370 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Cayuga | — |
| 2005-11-28 | 289-764 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Brampton | — |
| 2005-10-18 | 289-293 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Burlington | — |
| 2005-10-14 | 289-294 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Niagara Falls | — |
| 2005-10-14 | 289-295 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Oakville | — |
| 2005-10-12 | 289-288 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Burlington | — |
| 2005-10-12 | 289-291 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Oakville | — |
| 2005-10-12 | 289-292 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Niagara Falls | — |
| 2005-04-26 | 289-290 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Streetsville | — |
| 2005-03-14 | 289-280 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Mount Hope | — |
| 2005-03-14 | 289-281 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Mount Hope | — |
| 2005-03-14 | 289-282 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Hagersville | — |
| 2005-03-14 | 289-283 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Hagersville | — |
| 2005-03-14 | 289-284 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Caledonia | — |
| 2005-03-14 | 289-285 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Caledonia | — |
| 2005-03-14 | 289-286 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Binbrook | — |
| 2005-03-14 | 289-287 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Binbrook | — |
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.