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 |
|---|---|---|---|---|---|---|
| 2020-05-19 | 548-878 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Wallaceburg | — |
| 2019-12-11 | 548-869 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Baden | — |
| 2019-12-11 | 548-870 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | St. Clements | — |
| 2019-12-11 | 548-871 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Linwood | — |
| 2019-12-11 | 548-872 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Elmira | — |
| 2019-12-10 | 548-867 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ayr | — |
| 2019-12-10 | 548-868 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Breslau | — |
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.