NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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.
Most active assignees, all time — NPA 289
New assignments by month
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2017-05-26 | 289-367 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2015-06-15 | 289-677 | not yet reported which blocks → | Iristel Inc. | 154E | Cobourg | — |
| 2014-12-05 | 289-513 | not yet reported which blocks → | Iristel Inc. | 154E | Bowmanville | — |
| 2014-12-05 | 289-514 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2012-05-02 | 289-307 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2012-05-02 | 289-512 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2012-05-02 | 289-817 | not yet reported which blocks → | Iristel Inc. | 154E | Oakville | — |
| 2012-04-27 | 289-768 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2012-04-27 | 289-769 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2012-04-27 | 289-901 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2012-04-27 | 289-902 | not yet reported which blocks → | Iristel Inc. | 154E | Ancaster | — |
| 2012-04-27 | 289-906 | not yet reported which blocks → | Iristel Inc. | 154E | Bolton | — |
| 2012-04-05 | 289-672 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara-On-The-Lake | — |
| 2012-04-02 | 289-402 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara Falls | — |
| 2012-04-02 | 289-797 | not yet reported which blocks → | Iristel Inc. | 154E | Grimsby | — |
| 2012-03-28 | 289-724 | not yet reported which blocks → | Iristel Inc. | 154E | Cooksville | — |
| 2012-03-23 | 289-536 | not yet reported which blocks → | Iristel Inc. | 154E | Woodbridge | — |
| 2012-03-23 | 289-914 | not yet reported which blocks → | Iristel Inc. | 154E | Streetsville | — |
| 2012-03-23 | 289-985 | not yet reported which blocks → | Iristel Inc. | 154E | Whitby | — |
| 2012-03-22 | 289-903 | not yet reported which blocks → | Iristel Inc. | 154E | Newmarket | — |
| 2012-03-22 | 289-917 | not yet reported which blocks → | Iristel Inc. | 154E | Maple | — |
| 2012-03-21 | 289-904 | not yet reported which blocks → | Iristel Inc. | 154E | Malton | — |
| 2012-03-21 | 289-907 | not yet reported which blocks → | Iristel Inc. | 154E | King City | — |
| 2012-03-19 | 289-306 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2012-03-19 | 289-796 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2012-03-01 | 289-723 | not yet reported which blocks → | Iristel Inc. | 154E | St. Catharines-Thorold | — |
| 2012-02-27 | 289-778 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2012-02-23 | 289-401 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2012-02-14 | 289-460 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2012-02-14 | 289-670 | not yet reported which blocks → | Iristel Inc. | 154E | Milton | — |
| 2012-01-19 | 289-312 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2011-12-22 | 289-816 | not yet reported which blocks → | Iristel Inc. | 154E | Burlington | — |
| 2011-12-21 | 289-779 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2011-12-16 | 289-302 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara Falls | — |
| 2011-10-04 | 289-819 | not yet reported which blocks → | Iristel Inc. | 154E | Richmond Hill | — |
| 2011-09-22 | 289-815 | not yet reported which blocks → | Iristel Inc. | 154E | Oakville | — |
| 2011-07-27 | 289-301 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2011-07-25 | 289-780 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2011-07-08 | 289-201 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2010-05-27 | 289-799 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2008-11-23 | 289-206 | not yet reported which blocks → | Iristel Inc. | 154E | Bolton | — |
| 2008-11-23 | 289-207 | not yet reported which blocks → | Iristel Inc. | 154E | King City | — |
| 2008-11-23 | 289-210 | not yet reported which blocks → | Iristel Inc. | 154E | Oak Ridges | — |
| 2008-11-23 | 289-212 | not yet reported which blocks → | Iristel Inc. | 154E | Stouffville | — |
| 2008-11-23 | 289-216 | not yet reported which blocks → | Iristel Inc. | 154E | Kleinburg | — |
| 2008-11-23 | 289-217 | not yet reported which blocks → | Iristel Inc. | 154E | Maple | — |
| 2008-11-23 | 289-236 | not yet reported which blocks → | Iristel Inc. | 154E | Woodbridge | — |
| 2008-11-23 | 289-273 | not yet reported which blocks → | Iristel Inc. | 154E | St. Catharines-Thorold | — |
| 2008-11-23 | 289-278 | not yet reported which blocks → | Iristel Inc. | 154E | Whitby | — |
| 2008-11-21 | 289-203 | not yet reported which blocks → | Iristel Inc. | 154E | Stoney Creek | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.