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 450
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 |
|---|---|---|---|---|---|---|
| 2012-02-27 | 450-913 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Coteau-Landing | — |
| 2012-02-24 | 450-605 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Riviere-Beaudette | — |
| 2012-02-24 | 450-606 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Clet | — |
| 2012-02-24 | 450-609 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Justine-de-Newton | — |
| 2012-02-24 | 450-620 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Polycarpe | — |
| 2011-09-30 | 450-866 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Jacques | — |
| 2011-09-30 | 450-870 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Michel-des-Saints | — |
| 2011-09-28 | 450-832 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Jean-de-Matha | — |
| 2011-09-28 | 450-837 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Felix-de-Valois | — |
| 2011-09-28 | 450-840 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Gabriel-de-Brandon | — |
| 2011-09-28 | 450-842 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Barthelemy | — |
| 2011-09-28 | 450-850 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Alphonse-de-Rodriguez | — |
| 2011-05-26 | 450-554 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Farnham | — |
| 2011-05-26 | 450-570 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Napierville | — |
| 2011-05-26 | 450-590 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Bedford | — |
| 2011-05-26 | 450-604 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Lacolle | — |
| 2011-05-18 | 450-529 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Jean | — |
| 2011-04-18 | 450-519 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Martine | — |
| 2011-04-18 | 450-520 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Chrysostome | — |
| 2011-03-15 | 450-391 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Marthe | — |
| 2010-10-01 | 450-386 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Joliette | — |
| 2009-11-20 | 450-249 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Sorel | — |
| 2007-05-25 | 450-327 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Jerome | — |
| 2006-09-07 | 450-238 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chomedey | — |
| 2006-09-07 | 450-239 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Laval-Est | — |
| 2006-09-07 | 450-241 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Laval-Ouest | — |
| 2006-09-07 | 450-254 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Rose | — |
| 2006-09-07 | 450-255 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Vincent-de-Paul | — |
| 2006-09-07 | 450-323 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Eustache | — |
| 2006-09-07 | 450-324 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ste-Julie-de-Vercheres | — |
| 2006-09-06 | 450-262 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Beloeil | — |
| 2006-09-06 | 450-274 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Boucherville | — |
| 2006-09-06 | 450-279 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chambly | — |
| 2006-09-06 | 450-282 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Laprairie | — |
| 2006-09-06 | 450-283 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Bruno | — |
| 2006-09-06 | 450-285 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Varennes | — |
| 2006-09-06 | 450-286 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Longueuil | — |
| 2006-09-06 | 450-289 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Beauharnois | — |
| 2006-09-06 | 450-290 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Constant | — |
| 2006-09-06 | 450-301 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Remi | — |
| 2006-09-06 | 450-306 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Cowansville | — |
| 2006-09-06 | 450-309 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Hudson | — |
| 2006-09-06 | 450-313 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Mascouche | — |
| 2006-09-06 | 450-316 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Coteau-du-Lac | — |
| 2006-09-06 | 450-317 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Les Cedres | — |
| 2006-09-06 | 450-318 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Rigaud | — |
| 2006-09-06 | 450-319 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Vaudreuil | — |
| 2006-09-05 | 450-256 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Pont-Viau | — |
| 2006-09-05 | 450-259 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St-Lambert | — |
| 2006-09-05 | 450-287 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Chateauguay | — |
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.