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 |
|---|---|---|---|---|---|---|
| — | 519-359 | not yet reported which blocks → | Bell Mobility | 6574 | Chatham | — |
| — | 519-577 | not yet reported which blocks → | Bell Mobility | 6574 | Kitchener-Waterloo | — |
| — | 519-580 | not yet reported which blocks → | Bell Mobility | 6574 | Kitchener-Waterloo | — |
| — | 519-588 | not yet reported which blocks → | Bell Mobility | 6574 | Kitchener-Waterloo | — |
| — | 519-671 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-831 | not yet reported which blocks → | Bell Mobility | 6574 | Guelph | — |
| — | 519-857 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-868 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-870 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-871 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-872 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-878 | not yet reported which blocks → | Bell Mobility | 6574 | London | — |
| — | 519-981 | not yet reported which blocks → | Bell Mobility | 6574 | Windsor | — |
| — | 519-984 | not yet reported which blocks → | Bell Mobility | 6574 | Windsor | — |
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.