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 |
|---|---|---|---|---|---|---|
| 2015-03-12 | 289-542 | not yet reported which blocks → | InnSysVoice Corp | 383H | Nobleton | — |
| 2015-03-12 | 289-546 | not yet reported which blocks → | InnSysVoice Corp | 383H | Palgrave | — |
| 2015-03-12 | 289-549 | not yet reported which blocks → | InnSysVoice Corp | 383H | Queensville | — |
| 2015-03-12 | 289-557 | not yet reported which blocks → | InnSysVoice Corp | 383H | Schomberg | — |
| 2015-03-11 | 289-461 | not yet reported which blocks → | InnSysVoice Corp | 383H | Bolton | — |
| 2015-03-11 | 289-462 | not yet reported which blocks → | InnSysVoice Corp | 383H | Claremont | — |
| 2015-03-11 | 289-486 | not yet reported which blocks → | InnSysVoice Corp | 383H | Gormley | — |
| 2015-03-11 | 289-528 | not yet reported which blocks → | InnSysVoice Corp | 383H | Keswick | — |
| 2015-03-11 | 289-530 | not yet reported which blocks → | InnSysVoice Corp | 383H | King City | — |
| 2015-03-11 | 289-531 | not yet reported which blocks → | InnSysVoice Corp | 383H | Kleinburg | — |
| 2015-03-10 | 289-258 | not yet reported which blocks → | InnSysVoice Corp | 383H | Aurora | — |
| 2015-03-10 | 289-262 | not yet reported which blocks → | InnSysVoice Corp | 383H | Bethesda | — |
| 2014-10-15 | 289-666 | not yet reported which blocks → | InnSysVoice Corp | 383H | Markham | — |
| 2014-10-15 | 289-900 | not yet reported which blocks → | InnSysVoice Corp | 383H | Brampton | — |
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.