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 |
|---|---|---|---|---|---|---|
| 2013-03-28 | 613-515 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ottawa-Hull | — |
| 2010-12-03 | 613-502 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Gloucester | — |
| 2010-12-03 | 613-508 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Carleton Place | — |
| 2010-12-03 | 613-509 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Kanata-Stittsville | — |
| 2010-12-03 | 613-510 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Orleans | — |
| 2010-12-03 | 613-512 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Jockvale | — |
| 2010-12-03 | 613-516 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Osgoode | — |
| 2010-12-03 | 613-517 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Cumberland | — |
| 2010-12-01 | 613-518 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ottawa-Hull | — |
| 2007-05-30 | 613-486 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Frankford | — |
| 2007-05-30 | 613-490 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Stirling | — |
| 2007-05-30 | 613-494 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Thurlow | — |
| 2007-05-30 | 613-495 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Trenton | — |
| 2007-05-30 | 613-497 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Wooler | — |
| 2007-05-29 | 613-459 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Jockvale | — |
| 2007-05-29 | 613-465 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Osgoode | — |
| 2007-05-29 | 613-467 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Cumberland | — |
| 2007-05-29 | 613-480 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Belleville | — |
| 2007-05-25 | 613-454 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Ottawa-Hull | — |
| 2007-05-25 | 613-455 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Gloucester | — |
| 2007-05-25 | 613-456 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Carleton Place | — |
| 2007-05-25 | 613-457 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Kanata-Stittsville | — |
| 2007-05-25 | 613-458 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Orleans | — |
| 2007-05-25 | 613-481 | not yet reported which blocks → | ISP Telecom Inc. | 4727 | Brighton | — |
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.