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 579
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2024-12-16 | 579-503 | not yet reported which blocks → | Iristel Inc. | 154E | Joliette | — |
| 2024-12-13 | 579-689 | not yet reported which blocks → | Iristel Inc. | 154E | Chambly | — |
| 2024-12-13 | 579-944 | not yet reported which blocks → | Iristel Inc. | 154E | Granby | — |
| 2024-12-09 | 579-586 | not yet reported which blocks → | Iristel Inc. | 154E | St-Eustache | — |
| 2024-12-03 | 579-568 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Est | — |
| 2024-12-03 | 579-702 | not yet reported which blocks → | Iristel Inc. | 154E | Pont-Viau | — |
| 2024-06-24 | 579-972 | not yet reported which blocks → | Iristel Inc. | 154E | Lanoraie | — |
| 2024-05-27 | 579-965 | not yet reported which blocks → | Iristel Inc. | 154E | St-Sauveur | — |
| 2024-05-16 | 579-984 | not yet reported which blocks → | Iristel Inc. | 154E | L'Epiphanie-l'Assomption | — |
| 2024-05-15 | 579-778 | not yet reported which blocks → | Iristel Inc. | 154E | Lachute | — |
| 2024-03-01 | 579-975 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Ouest | — |
| 2024-02-29 | 579-974 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Ouest | — |
| 2022-08-18 | 579-827 | not yet reported which blocks → | Iristel Inc. | 154E | Valleyfield | — |
| 2020-09-21 | 579-829 | not yet reported which blocks → | Iristel Inc. | 154E | Valleyfield | — |
| 2020-09-14 | 579-569 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Est | — |
| 2020-09-01 | 579-550 | not yet reported which blocks → | Iristel Inc. | 154E | Longueuil | — |
| 2020-08-31 | 579-539 | not yet reported which blocks → | Iristel Inc. | 154E | Chomedey | — |
| 2020-02-11 | 579-899 | not yet reported which blocks → | Iristel Inc. | 154E | St-Lin | — |
| 2020-01-22 | 579-759 | not yet reported which blocks → | Iristel Inc. | 154E | Sorel | — |
| 2019-10-18 | 579-798 | not yet reported which blocks → | Iristel Inc. | 154E | Lachute | — |
| 2019-07-26 | 579-807 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Est | — |
| 2019-07-26 | 579-978 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Ouest | — |
| 2019-07-26 | 579-986 | not yet reported which blocks → | Iristel Inc. | 154E | L'Epiphanie-l'Assomption | — |
| 2019-07-26 | 579-992 | not yet reported which blocks → | Iristel Inc. | 154E | Lanoraie | — |
| 2018-07-05 | 579-502 | not yet reported which blocks → | Iristel Inc. | 154E | Joliette | — |
| 2017-12-11 | 579-486 | not yet reported which blocks → | Iristel Inc. | 154E | St-Eustache | — |
| 2017-11-30 | 579-302 | not yet reported which blocks → | Iristel Inc. | 154E | Pont-Viau | — |
| 2017-11-30 | 579-806 | not yet reported which blocks → | Iristel Inc. | 154E | Laprairie | — |
| 2017-11-30 | 579-988 | not yet reported which blocks → | Iristel Inc. | 154E | Ste-Therese | — |
| 2017-11-23 | 579-803 | not yet reported which blocks → | Iristel Inc. | 154E | Lachute | — |
| 2017-11-23 | 579-804 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Est | — |
| 2017-11-23 | 579-805 | not yet reported which blocks → | Iristel Inc. | 154E | Laval-Ouest | — |
| 2017-08-09 | 579-802 | not yet reported which blocks → | Iristel Inc. | 154E | Valleyfield | — |
| 2017-08-08 | 579-401 | not yet reported which blocks → | Iristel Inc. | 154E | Marieville | — |
| 2017-07-20 | 579-485 | not yet reported which blocks → | Iristel Inc. | 154E | St-Eustache | — |
| 2017-06-08 | 579-801 | not yet reported which blocks → | Iristel Inc. | 154E | St-Jean | — |
| 2017-06-02 | 579-991 | not yet reported which blocks → | Iristel Inc. | 154E | St-Jerome | — |
| 2017-06-02 | 579-993 | not yet reported which blocks → | Iristel Inc. | 154E | St-Lin | — |
| 2017-05-29 | 579-501 | not yet reported which blocks → | Iristel Inc. | 154E | Joliette | — |
| 2017-05-26 | 579-994 | not yet reported which blocks → | Iristel Inc. | 154E | Granby | — |
| 2016-03-07 | 579-794 | not yet reported which blocks → | Iristel Inc. | 154E | St-Jean | — |
| 2016-03-07 | 579-996 | not yet reported which blocks → | Iristel Inc. | 154E | St-Lin | — |
| 2016-03-07 | 579-997 | not yet reported which blocks → | Iristel Inc. | 154E | St-Hyacinthe | — |
| 2016-03-07 | 579-998 | not yet reported which blocks → | Iristel Inc. | 154E | St-Jerome | — |
| 2016-02-19 | 579-793 | not yet reported which blocks → | Iristel Inc. | 154E | Sorel | — |
| 2016-02-08 | 579-791 | not yet reported which blocks → | Iristel Inc. | 154E | Lachute | — |
| 2016-02-08 | 579-792 | not yet reported which blocks → | Iristel Inc. | 154E | Lanoraie | — |
| 2016-01-13 | 579-796 | not yet reported which blocks → | Iristel Inc. | 154E | L'Epiphanie-l'Assomption | — |
| 2015-09-28 | 579-790 | not yet reported which blocks → | Iristel Inc. | 154E | Valleyfield | — |
| 2015-06-15 | 579-795 | not yet reported which blocks → | Iristel Inc. | 154E | L'Epiphanie-l'Assomption | — |
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.