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
Sep 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2023-09-11 | 365-391 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2023-09-11 | 365-392 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2023-09-11 | 365-393 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2023-09-11 | 365-394 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2023-09-11 | 365-780 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2023-09-11 | 365-781 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2023-09-11 | 365-782 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2023-09-11 | 365-783 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2023-09-11 | 365-819 | not yet reported which blocks → | Iristel Inc. | 154E | Richmond Hill | — |
| 2023-09-11 | 365-820 | not yet reported which blocks → | Iristel Inc. | 154E | Richmond Hill | — |
| 2023-09-11 | 365-821 | not yet reported which blocks → | Iristel Inc. | 154E | Richmond Hill | — |
| 2023-09-11 | 365-826 | not yet reported which blocks → | Iristel Inc. | 154E | Richmond Hill | — |
| 2023-06-12 | 365-609 | not yet reported which blocks → | Iristel Inc. | 154E | Fort Erie | — |
| 2023-05-11 | 365-286 | not yet reported which blocks → | Iristel Inc. | 154E | Kleinburg | — |
| 2023-05-11 | 365-513 | not yet reported which blocks → | Iristel Inc. | 154E | Bowmanville | — |
| 2023-05-05 | 365-379 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2022-12-05 | 365-761 | not yet reported which blocks → | Iristel Inc. | 154E | Dunnville | — |
| 2022-12-05 | 365-797 | not yet reported which blocks → | Iristel Inc. | 154E | Grimsby | — |
| 2022-10-19 | 365-530 | not yet reported which blocks → | Iristel Inc. | 154E | Woodbridge | — |
| 2022-02-01 | 365-734 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2022-01-25 | 365-363 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2022-01-25 | 365-376 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2022-01-24 | 365-744 | not yet reported which blocks → | Iristel Inc. | 154E | Milton | — |
| 2021-10-15 | 365-730 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2021-10-15 | 365-731 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2021-10-15 | 365-732 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2021-02-23 | 365-736 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2021-02-23 | 365-980 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2021-02-10 | 365-960 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2021-02-10 | 365-970 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2020-09-21 | 365-297 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2020-09-14 | 365-795 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2020-09-09 | 365-536 | not yet reported which blocks → | Iristel Inc. | 154E | Unionville | — |
| 2020-09-01 | 365-977 | not yet reported which blocks → | Iristel Inc. | 154E | Oakville | — |
| 2020-09-01 | 365-990 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2020-08-31 | 365-544 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2020-08-27 | 365-725 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2020-08-27 | 365-735 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2020-02-26 | 365-364 | not yet reported which blocks → | Iristel Inc. | 154E | Welland | — |
| 2020-01-31 | 365-745 | not yet reported which blocks → | Iristel Inc. | 154E | Milton | — |
| 2020-01-31 | 365-825 | not yet reported which blocks → | Iristel Inc. | 154E | Newmarket | — |
| 2020-01-30 | 365-645 | not yet reported which blocks → | Iristel Inc. | 154E | Streetsville | — |
| 2020-01-30 | 365-675 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2020-01-29 | 365-305 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2020-01-29 | 365-360 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2020-01-29 | 365-361 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2020-01-29 | 365-362 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2020-01-21 | 365-615 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2020-01-21 | 365-625 | not yet reported which blocks → | Iristel Inc. | 154E | Thornhill | — |
| 2019-10-22 | 365-635 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
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.