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 |
|---|---|---|---|---|---|---|
| 2016-05-25 | 581-536 | not yet reported which blocks → | Comwave Networks | 160G | Roberval | — |
| 2016-05-25 | 581-750 | not yet reported which blocks → | Comwave Networks | 160G | Biencourt | — |
| 2016-05-25 | 581-751 | not yet reported which blocks → | Comwave Networks | 160G | La Pocatiere | — |
| 2016-05-25 | 581-752 | not yet reported which blocks → | Comwave Networks | 160G | Trois-Pistoles | — |
| 2015-03-23 | 581-530 | not yet reported which blocks → | Comwave Networks | 160G | Thetford Mines | — |
| 2014-08-29 | 581-534 | not yet reported which blocks → | Comwave Networks | 160G | Levis | — |
| 2014-08-29 | 581-535 | not yet reported which blocks → | Comwave Networks | 160G | Riviere-du-Loup | — |
| 2014-07-31 | 581-532 | not yet reported which blocks → | Comwave Networks | 160G | Chicoutimi | — |
| 2014-07-31 | 581-533 | not yet reported which blocks → | Comwave Networks | 160G | Alma | — |
| 2013-03-05 | 581-531 | not yet reported which blocks → | Comwave Networks | 160G | Quebec | — |
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.