NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026
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 |
|---|---|---|---|---|---|---|
| 2017-05-29 | 343-305 | not yet reported which blocks → | Iristel Inc. | 154E | Kingston | — |
| 2017-05-29 | 343-306 | not yet reported which blocks → | Iristel Inc. | 154E | Kingston | — |
| 2017-02-23 | 343-601 | not yet reported which blocks → | Iristel Inc. | 154E | Belleville | — |
| 2016-07-07 | 343-803 | not yet reported which blocks → | Iristel Inc. | 154E | Ottawa-Hull | — |
| 2016-02-16 | 343-301 | not yet reported which blocks → | Iristel Inc. | 154E | Cornwall | — |
| 2016-02-16 | 343-302 | not yet reported which blocks → | Iristel Inc. | 154E | Kingston | — |
| 2016-02-12 | 343-304 | not yet reported which blocks → | Iristel Inc. | 154E | Vankleek Hill | — |
| 2016-02-10 | 343-341 | not yet reported which blocks → | Iristel Inc. | 154E | Perth | — |
| 2016-02-09 | 343-340 | not yet reported which blocks → | Iristel Inc. | 154E | Merrickville | — |
| 2016-02-05 | 343-303 | not yet reported which blocks → | Iristel Inc. | 154E | Jockvale | — |
| 2016-02-03 | 343-503 | not yet reported which blocks → | Iristel Inc. | 154E | Carleton Place | — |
| 2016-02-01 | 343-943 | not yet reported which blocks → | Iristel Inc. | 154E | Bancroft | — |
| 2014-11-14 | 343-500 | not yet reported which blocks → | Iristel Inc. | 154E | Hawkesbury | — |
| 2014-03-03 | 343-600 | not yet reported which blocks → | Iristel Inc. | 154E | Belleville | — |
| 2013-10-11 | 343-300 | not yet reported which blocks → | Iristel Inc. | 154E | Brockville | — |
| 2013-10-11 | 343-800 | not yet reported which blocks → | Iristel Inc. | 154E | Smiths Falls | — |
| 2013-04-16 | 343-700 | not yet reported which blocks → | Iristel Inc. | 154E | Ottawa-Hull | — |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.