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 581
New assignments by month
Sep 2026
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Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2024-05-16 | 581-436 | not yet reported which blocks → | Iristel Inc. | 154E | Maria | — |
| 2024-03-04 | 581-432 | not yet reported which blocks → | Iristel Inc. | 154E | Sainte-Marie-de-Beauce | — |
| 2023-10-19 | 581-942 | not yet reported which blocks → | Iristel Inc. | 154E | Riviere-du-Loup | — |
| 2023-07-20 | 581-407 | not yet reported which blocks → | Bell Canada | 984C | Cap-aux-Meules | — |
| 2023-05-05 | 581-403 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2023-02-13 | 581-753 | not yet reported which blocks → | TELUS Quebec | 2243 | La Malbaie | — |
| 2023-01-31 | 581-402 | not yet reported which blocks → | Iristel Inc. | 346J | Rimouski | — |
| 2023-01-25 | 581-439 | not yet reported which blocks → | Iristel Inc. | 346J | Sainte-Anne-des-Monts | — |
| 2023-01-25 | 581-468 | not yet reported which blocks → | Iristel Inc. | 346J | Sainte-Anne-des-Monts | — |
| 2023-01-25 | 581-469 | not yet reported which blocks → | Iristel Inc. | 346J | Sainte-Anne-des-Monts | — |
| 2022-10-11 | 581-406 | not yet reported which blocks → | Fibernetics Corporation | 464D | Chicoutimi | — |
| 2022-09-14 | 581-467 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2022-06-30 | 581-689 | not yet reported which blocks → | Fibernetics Corporation | 464D | Quebec | — |
| 2022-06-20 | 581-404 | not yet reported which blocks → | IXICA Communications Inc. | 812H | Quebec | — |
| 2022-06-13 | 581-459 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2022-05-05 | 581-894 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2022-04-28 | 581-739 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2022-03-25 | 581-697 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Jean-de-Dieu | — |
| 2022-03-25 | 581-698 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Honore (Temiscouata Co.) | — |
| 2022-02-03 | 581-690 | not yet reported which blocks → | Iristel Inc. | 154E | Chicoutimi | — |
| 2022-02-01 | 581-465 | not yet reported which blocks → | Iristel Inc. | 154E | Matane | — |
| 2022-01-27 | 581-685 | not yet reported which blocks → | Iristel Inc. | 154E | Sept-Iles | — |
| 2022-01-25 | 581-410 | not yet reported which blocks → | Iristel Inc. | 154E | Sainte-Marie-de-Beauce | — |
| 2022-01-24 | 581-474 | not yet reported which blocks → | Iristel Inc. | 154E | Donnacona | — |
| 2022-01-19 | 581-893 | not yet reported which blocks → | Iristel Inc. | 154E | Chandler | — |
| 2022-01-17 | 581-687 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Brigitte-de-Laval | — |
| 2022-01-17 | 581-723 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Catherine | — |
| 2022-01-17 | 581-975 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Petronille | — |
| 2022-01-14 | 581-498 | not yet reported which blocks → | ISP Telecom Inc. | 448K | St-Jean-ile-d'Orleans | — |
| 2022-01-14 | 581-614 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Tite-des-Caps | — |
| 2021-10-19 | 581-210 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | Black Lake | — |
| 2021-10-19 | 581-413 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | Leeds | — |
| 2021-10-19 | 581-414 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | East Broughton | — |
| 2021-10-19 | 581-415 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | St-Methode-de-Frontenac | — |
| 2021-10-19 | 581-416 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | Tring Jonction | — |
| 2021-10-19 | 581-417 | not yet reported which blocks → | IVIC Telecom s.e.n.c | 817D | Stratford | — |
| 2021-06-04 | 581-738 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2021-05-05 | 581-895 | not yet reported which blocks → | Iristel Inc. | 154E | Riviere-du-Loup | — |
| 2021-04-23 | 581-737 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2021-04-22 | 581-736 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2021-04-21 | 581-735 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2021-03-29 | 581-897 | not yet reported which blocks → | Fibernetics Corporation | 464D | Valcartier | — |
| 2021-03-29 | 581-901 | not yet reported which blocks → | Fibernetics Corporation | 464D | Boischatel | — |
| 2021-03-29 | 581-902 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Anne-de-Beaupre | — |
| 2021-03-29 | 581-903 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Brigitte-de-Laval | — |
| 2021-03-29 | 581-904 | not yet reported which blocks → | Fibernetics Corporation | 464D | Ste-Petronille | — |
| 2021-03-29 | 581-905 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Fereol | — |
| 2021-03-29 | 581-906 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Jean-ile-d'Orleans | — |
| 2021-03-29 | 581-907 | not yet reported which blocks → | Fibernetics Corporation | 464D | St-Tite-des-Caps | — |
| 2021-03-26 | 581-896 | not yet reported which blocks → | Fibernetics Corporation | 464D | Stoneham | — |
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.