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.
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 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 | — |
| 2020-08-17 | 581-615 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Boischatel | — |
| 2020-08-17 | 581-616 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Loretteville | — |
| 2020-08-17 | 581-617 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Notre-Dame-des-Laurentides | — |
| 2020-08-17 | 581-618 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Fereol | — |
| 2020-08-17 | 581-619 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Anne-de-Beaupre | — |
| 2020-07-23 | 581-206 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Stoneham | — |
| 2020-07-23 | 581-207 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Valcartier | — |
| 2019-02-22 | 581-472 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Rimouski | — |
| 2017-06-14 | 581-473 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Felicien | — |
| 2017-02-09 | 581-479 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chibougamau | — |
| 2016-08-25 | 581-478 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Dolbeau | — |
| 2016-08-01 | 581-475 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chicoutimi | — |
| 2016-08-01 | 581-476 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Alma | — |
| 2016-06-22 | 581-477 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Levis | — |
| 2013-03-28 | 581-430 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chibougamau | — |
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.