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.
Most active assignees, all time — NPA 548
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | NPA-NXX | Thousands-blocks taken (last-4 opening) | Code holder | OCN | Rate center | State |
|---|---|---|---|---|---|---|
| 2025-12-03 | 548-591 | not yet reported which blocks → | Iristel Inc. | 154E | Sarnia | — |
| 2025-10-14 | 548-696 | not yet reported which blocks → | Iristel Inc. | 154E | London | — |
| 2024-10-16 | 548-497 | not yet reported which blocks → | Iristel Inc. | 154E | Woodstock | — |
| 2024-10-15 | 548-493 | not yet reported which blocks → | Iristel Inc. | 154E | Walkerton | — |
| 2024-10-11 | 548-298 | not yet reported which blocks → | Iristel Inc. | 154E | Tillsonburg | — |
| 2024-10-09 | 548-506 | not yet reported which blocks → | Iristel Inc. | 154E | Owen Sound | — |
| 2024-10-09 | 548-589 | not yet reported which blocks → | Iristel Inc. | 154E | St. Thomas | — |
| 2024-09-30 | 548-587 | not yet reported which blocks → | Iristel Inc. | 154E | Orangeville | — |
| 2024-09-26 | 548-327 | not yet reported which blocks → | Iristel Inc. | 154E | Listowel | — |
| 2024-09-24 | 548-762 | not yet reported which blocks → | Iristel Inc. | 154E | Guelph | — |
| 2024-09-18 | 548-291 | not yet reported which blocks → | Iristel Inc. | 154E | Durham | — |
| 2024-09-18 | 548-407 | not yet reported which blocks → | Iristel Inc. | 154E | Essex | — |
| 2024-09-04 | 548-797 | not yet reported which blocks → | Iristel Inc. | 154E | Chatham | — |
| 2024-05-03 | 548-581 | not yet reported which blocks → | Iristel Inc. | 154E | Sarnia | — |
| 2024-03-01 | 548-697 | not yet reported which blocks → | Iristel Inc. | 154E | London | — |
| 2024-03-01 | 548-698 | not yet reported which blocks → | Iristel Inc. | 154E | London | — |
| 2023-05-15 | 548-397 | not yet reported which blocks → | Iristel Inc. | 154E | Woodstock | — |
| 2023-05-12 | 548-293 | not yet reported which blocks → | Iristel Inc. | 154E | Walkerton | — |
| 2023-05-12 | 548-501 | not yet reported which blocks → | Iristel Inc. | 154E | Tillsonburg | — |
| 2023-05-12 | 548-582 | not yet reported which blocks → | Iristel Inc. | 154E | Sarnia | — |
| 2023-05-12 | 548-586 | not yet reported which blocks → | Iristel Inc. | 154E | St. Thomas | — |
| 2023-05-11 | 548-290 | not yet reported which blocks → | Iristel Inc. | 154E | Durham | — |
| 2023-05-11 | 548-325 | not yet reported which blocks → | Iristel Inc. | 154E | Listowel | — |
| 2023-05-11 | 548-406 | not yet reported which blocks → | Iristel Inc. | 154E | Essex | — |
| 2023-05-11 | 548-505 | not yet reported which blocks → | Iristel Inc. | 154E | Owen Sound | — |
| 2023-05-11 | 548-584 | not yet reported which blocks → | Iristel Inc. | 154E | Orangeville | — |
| 2022-10-20 | 548-554 | not yet reported which blocks → | Iristel Inc. | 154E | Aylmer | — |
| 2022-10-19 | 548-410 | not yet reported which blocks → | Iristel Inc. | 154E | Goderich | — |
| 2022-10-19 | 548-829 | not yet reported which blocks → | Iristel Inc. | 154E | Wingham | — |
| 2022-08-23 | 548-919 | not yet reported which blocks → | Iristel Inc. | 154E | Leamington | — |
| 2022-08-04 | 548-639 | not yet reported which blocks → | Iristel Inc. | 154E | Belmont | — |
| 2022-07-05 | 548-960 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-961 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-962 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-963 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-964 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-965 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-966 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-967 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-968 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-969 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-07-05 | 548-970 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2022-04-20 | 548-901 | not yet reported which blocks → | Iristel Inc. | 154E | Brantford | — |
| 2022-02-01 | 548-761 | not yet reported which blocks → | Iristel Inc. | 154E | Guelph | — |
| 2022-01-27 | 548-798 | not yet reported which blocks → | Iristel Inc. | 154E | Chatham | — |
| 2022-01-20 | 548-906 | not yet reported which blocks → | Iristel Inc. | 154E | Essex | — |
| 2022-01-19 | 548-918 | not yet reported which blocks → | Iristel Inc. | 154E | Leamington | — |
| 2021-11-10 | 548-708 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2021-11-10 | 548-709 | not yet reported which blocks → | Iristel Inc. | 154E | Windsor | — |
| 2021-08-05 | 548-409 | not yet reported which blocks → | Iristel Inc. | 154E | Goderich | — |
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.