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 403
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 |
|---|---|---|---|---|---|---|
| 2013-04-16 | 403-300 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2010-03-01 | 403-905 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Medicine Hat | — |
| 2010-02-18 | 403-904 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Pincher Creek | — |
| 2010-02-10 | 403-719 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2010-01-28 | 403-856 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Drumheller | — |
| 2010-01-28 | 403-871 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Rocky Mountain House | — |
| 2010-01-20 | 403-751 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Cowley | — |
| 2010-01-14 | 403-416 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Taber | — |
| 2009-10-16 | 403-930 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2009-08-17 | 403-460 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2009-07-08 | 403-753 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Crowsnest Pass | — |
| 2009-04-21 | 403-584 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Bow Island | — |
| 2009-04-21 | 403-595 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Ralston | — |
| 2009-03-20 | 403-405 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Coaldale | — |
| 2009-03-20 | 403-468 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Claresholm | — |
| 2009-03-20 | 403-557 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Fort Macleod | — |
| 2009-03-20 | 403-639 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Granum | — |
| 2009-03-20 | 403-659 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Cardston | — |
| 2009-03-20 | 403-745 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Picture Butte | — |
| 2009-03-20 | 403-759 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Magrath | — |
| 2009-03-19 | 403-474 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2009-02-24 | 403-487 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Medicine Hat | — |
| 2009-01-13 | 403-942 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Lethbridge | — |
| 2008-10-07 | 403-764 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2008-06-06 | 403-658 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Bentley | — |
| 2008-06-02 | 403-518 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Didsbury | — |
| 2008-06-02 | 403-573 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Penhold | — |
| 2008-06-02 | 403-600 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Blackfalds | — |
| 2008-06-02 | 403-657 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Bowden | — |
| 2008-05-27 | 403-674 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Exshaw | — |
| 2008-05-27 | 403-940 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Carstairs | — |
| 2008-05-27 | 403-941 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Crossfield | — |
| 2008-04-14 | 403-457 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2008-04-14 | 403-967 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Red Deer | — |
| 2008-03-13 | 403-453 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2008-02-14 | 403-840 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Cochrane | — |
| 2008-02-14 | 403-841 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | High River | — |
| 2008-02-14 | 403-842 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Okotoks | — |
| 2007-12-03 | 403-791 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Olds | — |
| 2007-12-03 | 403-864 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Sylvan Lake | — |
| 2007-12-03 | 403-865 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Innisfail | — |
| 2007-12-01 | 403-789 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Lacombe | — |
| 2007-12-01 | 403-790 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Ponoka | — |
| 2007-12-01 | 403-960 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Airdrie | — |
| 2007-12-01 | 403-961 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Canmore | — |
| 2007-12-01 | 403-962 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Strathmore | — |
| 2007-12-01 | 403-986 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Red Deer | — |
| 2007-11-27 | 403-985 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Banff | — |
| 2007-09-19 | 403-452 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
| 2007-05-07 | 403-455 | not yet reported which blocks → | Shaw Telecom Inc. | 497E | Calgary | — |
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.