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.
Most active assignees, all time — NPA 365
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 |
|---|---|---|---|---|---|---|
| 2019-10-22 | 365-636 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2019-10-18 | 365-799 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2019-10-15 | 365-607 | not yet reported which blocks → | Iristel Inc. | 154E | Fort Erie | — |
| 2019-07-24 | 365-605 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2019-07-24 | 365-606 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2019-07-17 | 365-691 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2019-07-16 | 365-689 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2019-07-16 | 365-690 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2019-07-15 | 365-687 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2019-07-05 | 365-661 | not yet reported which blocks → | Iristel Inc. | 154E | Dunnville | — |
| 2019-05-03 | 365-809 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2019-05-02 | 365-298 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2019-02-05 | 365-398 | not yet reported which blocks → | Iristel Inc. | 154E | Cobourg | — |
| 2018-07-06 | 365-399 | not yet reported which blocks → | Iristel Inc. | 154E | Cobourg | — |
| 2018-07-04 | 365-598 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2018-06-22 | 365-692 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2018-06-22 | 365-693 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2018-06-22 | 365-694 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2018-03-07 | 365-807 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2018-03-07 | 365-808 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2018-03-01 | 365-805 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2018-03-01 | 365-806 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2017-11-20 | 365-695 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2017-11-20 | 365-696 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2017-11-20 | 365-697 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2017-11-20 | 365-698 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2017-11-06 | 365-599 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2017-10-04 | 365-604 | not yet reported which blocks → | Iristel Inc. | 154E | Oakville | — |
| 2017-10-03 | 365-603 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara Falls | — |
| 2017-08-08 | 365-660 | not yet reported which blocks → | Iristel Inc. | 154E | St. Catharines-Thorold | — |
| 2017-08-03 | 365-299 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2017-07-20 | 365-699 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2017-07-13 | 365-217 | not yet reported which blocks → | Iristel Inc. | 154E | Maple | — |
| 2017-06-06 | 365-601 | not yet reported which blocks → | Iristel Inc. | 154E | Stoney Creek | — |
| 2017-06-06 | 365-602 | not yet reported which blocks → | Iristel Inc. | 154E | Stoney Creek | — |
| 2017-06-02 | 365-658 | not yet reported which blocks → | Iristel Inc. | 154E | Milton | — |
| 2017-06-02 | 365-659 | not yet reported which blocks → | Iristel Inc. | 154E | Newmarket | — |
| 2017-05-26 | 365-656 | not yet reported which blocks → | Iristel Inc. | 154E | Streetsville | — |
| 2017-05-26 | 365-657 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2017-02-24 | 365-649 | not yet reported which blocks → | Iristel Inc. | 154E | Claremont | — |
| 2017-02-23 | 365-804 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2017-02-17 | 365-600 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2017-02-17 | 365-700 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2016-09-23 | 365-803 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2016-08-31 | 365-802 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2016-03-07 | 365-654 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2016-03-07 | 365-655 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2016-02-18 | 365-653 | not yet reported which blocks → | Iristel Inc. | 154E | St. Catharines-Thorold | — |
| 2016-02-16 | 365-652 | not yet reported which blocks → | Iristel Inc. | 154E | Welland | — |
| 2016-02-04 | 365-651 | not yet reported which blocks → | Iristel Inc. | 154E | Dunnville | — |
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.