NumberResearchRecent prefix assignments
1 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 |
|---|---|---|---|---|---|---|
| 2026-09-15 | 385-641 | 2XXX3XXX4XXX5XXX6XXX which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | MIDVALE | UT |
| 2023-05-04 | 385-531 | 0–9 XXXall 10 · 2 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2022-10-21 | 385-478 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2019-06-27 | 385-432 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | OGDEN | UT |
| 2018-09-04 | 385-420 | 0–9 XXXall 10 · 8 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2016-04-20 | 385-258 | 0–9 XXXall 10 · 3 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2015-08-07 | 385-383 | 0–9 XXXall 10 · 6 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | CLEARFIELD | UT |
| 2014-04-09 | 385-355 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2012-10-29 | 385-474 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | MURRAY | UT |
| 2011-09-27 | 385-282 | 0–9 XXXall 10 · 5 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2011-05-06 | 385-202 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
| 2010-12-17 | 385-212 | 0–9 XXXall 10 · 4 holders which blocks → | LEVEL 3 COMMUNICATIONS, LLC - UT | 3231 | SALT LAKE | UT |
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.