NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2015-07-13 | 581-349 | not yet reported which blocks → | Bell Mobility | 6574 | Quebec | — |
| 2015-06-19 | 581-578 | not yet reported which blocks → | TELUS Mobility | 8303 | Quebec | — |
| 2015-06-09 | 581-399 | not yet reported which blocks → | Bell Mobility | 6574 | Thetford Mines | — |
| 2015-05-28 | 581-201 | not yet reported which blocks → | Distributel | 083E | Quebec | — |
| 2015-05-22 | 581-464 | not yet reported which blocks → | Bell Mobility | 6574 | Chibougamau | — |
| 2015-04-10 | 581-550 | not yet reported which blocks → | TELUS Quebec | 8083 | Sainte-Marie-de-Beauce | — |
| 2015-04-10 | 581-551 | not yet reported which blocks → | TELUS Quebec | 8083 | Saint-Henri-de-Levis | — |
| 2015-04-10 | 581-552 | not yet reported which blocks → | TELUS Quebec | 8083 | Montmagny | — |
| 2015-04-06 | 581-548 | not yet reported which blocks → | TELUS Quebec | 2243 | Cabano | — |
| 2015-04-06 | 581-549 | not yet reported which blocks → | TELUS Quebec | 2243 | Trois-Pistoles | — |
| 2015-03-23 | 581-530 | not yet reported which blocks → | Comwave Networks | 160G | Thetford Mines | — |
| 2015-02-18 | 581-543 | not yet reported which blocks → | TELUS Quebec | 2243 | Chicoutimi | — |
| 2015-02-18 | 581-544 | not yet reported which blocks → | TELUS Quebec | 2243 | Jonquiere | — |
| 2015-02-18 | 581-545 | not yet reported which blocks → | TELUS Quebec | 2243 | La Baie (Chicoutimi Co.) | — |
| 2015-02-18 | 581-546 | not yet reported which blocks → | TELUS Quebec | 2243 | Laterriere | — |
| 2015-02-18 | 581-547 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Honore (Chicoutimi Co.) | — |
| 2014-12-31 | 581-636 | not yet reported which blocks → | TELUS Quebec | 8083 | Riviere-au-Renard | — |
| 2014-12-31 | 581-637 | not yet reported which blocks → | TELUS Quebec | 8083 | Cloridorme | — |
| 2014-12-31 | 581-638 | not yet reported which blocks → | TELUS Quebec | 8083 | Grande-Vallee | — |
| 2014-12-31 | 581-639 | not yet reported which blocks → | TELUS Quebec | 8083 | Murdochville | — |
| 2014-12-24 | 581-635 | not yet reported which blocks → | TELUS Quebec | 8083 | Cap-des-Rosiers | — |
| 2014-12-23 | 581-525 | not yet reported which blocks → | Bell Mobility | 6574 | Rimouski | — |
| 2014-12-22 | 581-538 | not yet reported which blocks → | TELUS Quebec | 2243 | Boischatel | — |
| 2014-12-22 | 581-539 | not yet reported which blocks → | TELUS Quebec | 2243 | Notre-Dame-des-Laurentides | — |
| 2014-12-22 | 581-540 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Anne-de-Beaupre | — |
| 2014-12-22 | 581-541 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Brigitte-de-Laval | — |
| 2014-12-22 | 581-542 | not yet reported which blocks → | TELUS Quebec | 2243 | Ste-Catherine | — |
| 2014-12-03 | 581-575 | not yet reported which blocks → | TELUS Mobility | 8303 | Grande-Vallee | — |
| 2014-11-07 | 581-315 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Prosper-de-Dorchester | — |
| 2014-10-09 | 581-664 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Roch-des-Aulnaies | — |
| 2014-10-09 | 581-665 | not yet reported which blocks → | Videotron Ltd. | 328F | Saint-Simon-de-Rimouski | — |
| 2014-10-03 | 581-651 | not yet reported which blocks → | Videotron Ltd. | 8306 | Girardville | — |
| 2014-08-29 | 581-373 | not yet reported which blocks → | Videotron Ltd. | 8306 | Biencourt | — |
| 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 | — |
| 2014-08-21 | 581-366 | not yet reported which blocks → | Zayo Canada Inc. | 8304 | Quebec | — |
| 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 | — |
| 2014-07-28 | 581-212 | not yet reported which blocks → | TELUS Quebec | 2243 | Dolbeau | — |
| 2014-07-28 | 581-217 | not yet reported which blocks → | TELUS Quebec | 2243 | Roberval | — |
| 2014-07-28 | 581-218 | not yet reported which blocks → | TELUS Quebec | 2243 | St-Felicien | — |
| 2014-07-23 | 581-627 | not yet reported which blocks → | TELUS Quebec | 2243 | Chibougamau | — |
| 2014-07-17 | 581-216 | not yet reported which blocks → | TELUS Quebec | 2243 | Alma | — |
| 2014-07-17 | 581-314 | not yet reported which blocks → | Videotron Ltd. | 328F | Rimouski | — |
| 2014-07-02 | 581-925 | not yet reported which blocks → | Distributel | 083E | Quebec | — |
| 2014-06-17 | 581-328 | not yet reported which blocks → | Videotron Ltd. | 8306 | Armagh | — |
| 2014-06-17 | 581-332 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Paul-de-Montminy | — |
| 2014-06-06 | 581-457 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Simon-de-Rimouski | — |
| 2014-06-06 | 581-930 | not yet reported which blocks → | Videotron Ltd. | 8306 | Saint-Basile | — |
| 2014-06-05 | 581-920 | not yet reported which blocks → | Fido Solutions Inc. | 8820 | Levis | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.