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 289
New assignments by month
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| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2014-01-09 | 289-728 | not yet reported which blocks → | Comwave Networks | 160G | Milton | — |
| 2014-01-09 | 289-767 | not yet reported which blocks → | Comwave Networks | 160G | Waterdown | — |
| 2014-01-09 | 289-787 | not yet reported which blocks → | Comwave Networks | 160G | Burlington | — |
| 2014-01-09 | 289-790 | not yet reported which blocks → | Comwave Networks | 160G | Georgetown | — |
| 2014-01-09 | 289-910 | not yet reported which blocks → | Comwave Networks | 160G | Oakville | — |
| 2013-08-15 | 289-601 | not yet reported which blocks → | Comwave Networks | 160G | Fisherville | — |
| 2013-08-15 | 289-602 | not yet reported which blocks → | Comwave Networks | 160G | Beamsville | — |
| 2013-08-15 | 289-603 | not yet reported which blocks → | Comwave Networks | 160G | Cayuga | — |
| 2013-08-15 | 289-604 | not yet reported which blocks → | Comwave Networks | 160G | Dunnville | — |
| 2013-08-15 | 289-605 | not yet reported which blocks → | Comwave Networks | 160G | Vineland | — |
| 2013-08-15 | 289-606 | not yet reported which blocks → | Comwave Networks | 160G | St. Catharines-Thorold | — |
| 2013-08-15 | 289-607 | not yet reported which blocks → | Comwave Networks | 160G | Wellandport | — |
| 2013-05-17 | 289-594 | not yet reported which blocks → | Comwave Networks | 160G | Palgrave | — |
| 2013-05-15 | 289-592 | not yet reported which blocks → | Comwave Networks | 160G | Schomberg | — |
| 2013-05-15 | 289-593 | not yet reported which blocks → | Comwave Networks | 160G | Thornhill | — |
| 2013-05-15 | 289-595 | not yet reported which blocks → | Comwave Networks | 160G | Uxbridge | — |
| 2013-05-15 | 289-596 | not yet reported which blocks → | Comwave Networks | 160G | Woodbridge | — |
| 2013-05-15 | 289-614 | not yet reported which blocks → | Comwave Networks | 160G | Aurora | — |
| 2013-05-15 | 289-615 | not yet reported which blocks → | Comwave Networks | 160G | Bethesda | — |
| 2013-05-15 | 289-616 | not yet reported which blocks → | Comwave Networks | 160G | Bolton | — |
| 2013-05-15 | 289-617 | not yet reported which blocks → | Comwave Networks | 160G | Gormley | — |
| 2013-05-15 | 289-618 | not yet reported which blocks → | Comwave Networks | 160G | King City | — |
| 2013-05-15 | 289-661 | not yet reported which blocks → | Comwave Networks | 160G | Markham | — |
| 2013-05-15 | 289-662 | not yet reported which blocks → | Comwave Networks | 160G | Mount Albert | — |
| 2013-05-15 | 289-663 | not yet reported which blocks → | Comwave Networks | 160G | Newmarket | — |
| 2013-05-15 | 289-664 | not yet reported which blocks → | Comwave Networks | 160G | Nobleton | — |
| 2013-05-15 | 289-665 | not yet reported which blocks → | Comwave Networks | 160G | Oak Ridges | — |
| 2013-05-15 | 289-867 | not yet reported which blocks → | Comwave Networks | 160G | Richmond Hill | — |
| 2013-04-10 | 289-964 | not yet reported which blocks → | Comwave Networks | 160G | Newtonville | — |
| 2013-02-15 | 289-961 | not yet reported which blocks → | Comwave Networks | 160G | Caledon East | — |
| 2013-02-12 | 289-912 | not yet reported which blocks → | Comwave Networks | 160G | Port Perry | — |
| 2013-02-12 | 289-913 | not yet reported which blocks → | Comwave Networks | 160G | Ajax-Pickering | — |
| 2013-02-12 | 289-915 | not yet reported which blocks → | Comwave Networks | 160G | South Pickering | — |
| 2013-02-08 | 289-719 | not yet reported which blocks → | Comwave Networks | 160G | Streetsville | — |
| 2013-02-08 | 289-729 | not yet reported which blocks → | Comwave Networks | 160G | Malton | — |
| 2013-02-08 | 289-749 | not yet reported which blocks → | Comwave Networks | 160G | Castlemore | — |
| 2013-02-05 | 289-569 | not yet reported which blocks → | Comwave Networks | 160G | Brampton | — |
| 2013-02-05 | 289-869 | not yet reported which blocks → | Comwave Networks | 160G | Oshawa | — |
| 2013-01-28 | 289-560 | not yet reported which blocks → | Comwave Networks | 160G | West Lincoln | — |
| 2013-01-28 | 289-770 | not yet reported which blocks → | Comwave Networks | 160G | Grimsby | — |
| 2013-01-28 | 289-960 | not yet reported which blocks → | Comwave Networks | 160G | Caledonia | — |
| 2012-08-28 | 289-860 | not yet reported which blocks → | Comwave Networks | 160G | Hamilton | — |
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.