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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May 2026
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Dec 2025
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2019-10-29 | 581-489 | not yet reported which blocks → | Iristel Inc. | 346J | Sainte-Anne-des-Monts | — |
| 2019-10-29 | 581-780 | not yet reported which blocks → | Iristel Inc. | 346J | Havre-Saint-Pierre | — |
| 2019-10-29 | 581-871 | not yet reported which blocks → | Iristel Inc. | 346J | Natashquan | — |
| 2019-10-28 | 581-471 | not yet reported which blocks → | Iristel Inc. | 346J | Chandler | — |
| 2019-10-24 | 581-408 | not yet reported which blocks → | Iristel Inc. | 346J | Rimouski | — |
| 2019-10-24 | 581-409 | not yet reported which blocks → | Iristel Inc. | 346J | Baie-Comeau | — |
| 2019-10-10 | 581-909 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-10-07 | 581-978 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-09-16 | 581-506 | not yet reported which blocks → | Iristel Inc. | 154E | Rimouski | — |
| 2019-09-13 | 581-455 | not yet reported which blocks → | Videotron Ltd. | 8306 | La Guadeloupe | — |
| 2019-09-13 | 581-458 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Methode-de-Frontenac | — |
| 2019-09-12 | 581-454 | not yet reported which blocks → | Videotron Ltd. | 8306 | Disraeli | — |
| 2019-09-09 | 581-620 | not yet reported which blocks → | TELUS Mobility | 8303 | Blanc-Sablon | — |
| 2019-09-09 | 581-621 | not yet reported which blocks → | TELUS Mobility | 8303 | Mutton Bay | — |
| 2019-08-02 | 581-381 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Ephrem-de-Beauce | — |
| 2019-08-02 | 581-625 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Victor-de-Beauce | — |
| 2019-07-30 | 581-872 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2019-07-30 | 581-873 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2019-07-30 | 581-874 | not yet reported which blocks → | Iristel Inc. | 154E | Quebec | — |
| 2019-07-25 | 581-910 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-07-15 | 581-761 | not yet reported which blocks → | Bell Mobility | 6574 | Saint-Georges-de-Beauce | — |
| 2019-07-04 | 581-875 | not yet reported which blocks → | Iristel Inc. | 154E | Chicoutimi | — |
| 2019-07-04 | 581-876 | not yet reported which blocks → | Iristel Inc. | 154E | Chibougamau | — |
| 2019-05-21 | 581-864 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Gedeon-de-Beauce | — |
| 2019-05-03 | 581-203 | not yet reported which blocks → | Iristel Inc. | 154E | Alma | — |
| 2019-03-14 | 581-557 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-03-14 | 581-686 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-03-14 | 581-699 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-03-14 | 581-787 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-03-14 | 581-898 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-03-14 | 581-955 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-03-14 | 581-977 | not yet reported which blocks → | Rogers Communications Canada Inc. (Wireless) | 8821 | Quebec | — |
| 2019-02-22 | 581-472 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Rimouski | — |
| 2019-02-21 | 581-944 | not yet reported which blocks → | Videotron Ltd. | 8306 | East Broughton | — |
| 2019-02-21 | 581-979 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2019-02-20 | 581-940 | not yet reported which blocks → | Videotron Ltd. | 8306 | Leeds | — |
| 2019-02-20 | 581-941 | not yet reported which blocks → | Videotron Ltd. | 8306 | Inverness | — |
| 2019-02-20 | 581-943 | not yet reported which blocks → | Videotron Ltd. | 8306 | Stratford | — |
| 2018-12-20 | 581-937 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Magloire | — |
| 2018-12-20 | 581-938 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Odilon | — |
| 2018-12-20 | 581-939 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Zacharie | — |
| 2018-12-19 | 581-931 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Malachie | — |
| 2018-12-19 | 581-932 | not yet reported which blocks → | Videotron Ltd. | 8306 | Lac-Etchemin | — |
| 2018-12-19 | 581-933 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Camille | — |
| 2018-12-19 | 581-934 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Justine | — |
| 2018-12-19 | 581-935 | not yet reported which blocks → | Videotron Ltd. | 8306 | Sainte-Rose | — |
| 2018-12-19 | 581-936 | not yet reported which blocks → | Videotron Ltd. | 8306 | St-Just-de-Bretenieres | — |
| 2018-12-11 | 581-980 | not yet reported which blocks → | Videotron Ltd. | 328F | Quebec | — |
| 2018-11-14 | 581-863 | not yet reported which blocks → | Videotron Ltd. | 8306 | Chateau-Richer | — |
| 2018-11-09 | 581-448 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Prosper-de-Dorchester | — |
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.