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 |
|---|---|---|---|---|---|---|
| 2008-11-21 | 289-204 | not yet reported which blocks → | Iristel Inc. | 154E | Ancaster | — |
| 2008-11-21 | 289-205 | not yet reported which blocks → | Iristel Inc. | 154E | Grimsby | — |
| 2008-11-21 | 289-270 | not yet reported which blocks → | Iristel Inc. | 154E | Milton | — |
| 2008-11-21 | 289-271 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara Falls | — |
| 2008-11-21 | 289-272 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara-On-The-Lake | — |
| 2008-11-21 | 289-274 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2008-11-21 | 289-275 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2008-11-21 | 289-276 | not yet reported which blocks → | Iristel Inc. | 154E | Bowmanville | — |
| 2008-11-21 | 289-277 | not yet reported which blocks → | Iristel Inc. | 154E | South Pickering | — |
| 2007-12-19 | 289-812 | not yet reported which blocks → | Iristel Inc. | 154E | Burlington | — |
| 2007-12-19 | 289-813 | not yet reported which blocks → | Iristel Inc. | 154E | Oakville | — |
| 2007-12-19 | 289-814 | not yet reported which blocks → | Iristel Inc. | 154E | Streetsville | — |
| 2007-10-23 | 289-801 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2007-10-23 | 289-803 | not yet reported which blocks → | Iristel Inc. | 154E | Newmarket | — |
| 2007-10-23 | 289-804 | not yet reported which blocks → | Iristel Inc. | 154E | Malton | — |
| 2007-10-23 | 289-805 | not yet reported which blocks → | Iristel Inc. | 154E | Cooksville | — |
| 2007-10-23 | 289-806 | not yet reported which blocks → | Iristel Inc. | 154E | Unionville | — |
| 2007-10-23 | 289-807 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2007-10-23 | 289-809 | not yet reported which blocks → | Iristel Inc. | 154E | Richmond Hill | — |
| 2007-09-14 | 289-800 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2007-09-14 | 289-802 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
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.