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 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 |
|---|---|---|---|---|---|---|
| 2025-12-10 | 365-674 | not yet reported which blocks → | Iristel Inc. | 154E | St. Catharines-Thorold | — |
| 2025-12-01 | 365-478 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-12-01 | 365-479 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-12-01 | 365-486 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-12-01 | 365-487 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-11-25 | 365-632 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2025-11-25 | 365-634 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2025-11-19 | 365-854 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2025-11-19 | 365-856 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2025-11-19 | 365-857 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2025-03-10 | 365-664 | not yet reported which blocks → | Iristel Inc. | 154E | St. Catharines-Thorold | — |
| 2025-03-07 | 365-334 | not yet reported which blocks → | Iristel Inc. | 154E | Oshawa | — |
| 2025-03-06 | 365-412 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-03-06 | 365-413 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-03-06 | 365-414 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2025-03-06 | 365-464 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2024-10-15 | 365-646 | not yet reported which blocks → | Iristel Inc. | 154E | Unionville | — |
| 2024-10-11 | 365-620 | not yet reported which blocks → | Iristel Inc. | 154E | Stoney Creek | — |
| 2024-09-30 | 365-623 | not yet reported which blocks → | Iristel Inc. | 154E | Niagara Falls | — |
| 2024-09-30 | 365-827 | not yet reported which blocks → | Iristel Inc. | 154E | Newmarket | — |
| 2024-09-26 | 365-617 | not yet reported which blocks → | Iristel Inc. | 154E | Maple | — |
| 2024-09-25 | 365-287 | not yet reported which blocks → | Iristel Inc. | 154E | Kleinburg | — |
| 2024-09-25 | 365-909 | not yet reported which blocks → | Iristel Inc. | 154E | King City | — |
| 2024-09-24 | 365-796 | not yet reported which blocks → | Iristel Inc. | 154E | Hamilton | — |
| 2024-09-13 | 365-389 | not yet reported which blocks → | Iristel Inc. | 154E | Cobourg | — |
| 2024-09-04 | 365-816 | not yet reported which blocks → | Iristel Inc. | 154E | Burlington | — |
| 2024-08-27 | 365-387 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2024-08-27 | 365-517 | not yet reported which blocks → | Iristel Inc. | 154E | Bowmanville | — |
| 2024-08-27 | 365-644 | not yet reported which blocks → | Iristel Inc. | 154E | Brampton | — |
| 2024-08-27 | 365-829 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2024-08-27 | 365-906 | not yet reported which blocks → | Iristel Inc. | 154E | Bolton | — |
| 2024-05-30 | 365-354 | not yet reported which blocks → | Iristel Inc. | 154E | Welland | — |
| 2024-05-30 | 365-612 | not yet reported which blocks → | Iristel Inc. | 154E | Fort Erie | — |
| 2024-05-30 | 365-760 | not yet reported which blocks → | Iristel Inc. | 154E | Dunnville | — |
| 2024-05-03 | 365-904 | not yet reported which blocks → | Iristel Inc. | 154E | Malton | — |
| 2024-05-01 | 365-648 | not yet reported which blocks → | Iristel Inc. | 154E | Claremont | — |
| 2024-05-01 | 365-902 | not yet reported which blocks → | Iristel Inc. | 154E | Ancaster | — |
| 2024-03-05 | 365-461 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2024-03-05 | 365-462 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2024-03-05 | 365-463 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2024-02-22 | 365-830 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2024-02-22 | 365-831 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2024-02-22 | 365-832 | not yet reported which blocks → | Iristel Inc. | 154E | Aurora | — |
| 2024-02-13 | 365-396 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2024-02-13 | 365-397 | not yet reported which blocks → | Iristel Inc. | 154E | Ajax-Pickering | — |
| 2023-09-13 | 365-480 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2023-09-13 | 365-481 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2023-09-13 | 365-482 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2023-09-13 | 365-483 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
| 2023-09-13 | 365-484 | not yet reported which blocks → | Iristel Inc. | 154E | Markham | — |
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.