NumberResearchRecent prefix assignments
0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026
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 |
|---|---|---|---|---|---|---|
| 2019-09-06 | 405-674 | 0–9 XXXall 10 · 4 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | MUSTANG | OK |
| 2019-03-08 | 405-504 | 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 3 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | MINCO | OK |
| 2018-11-05 | 405-817 | 0–9 XXXall 10 · 3 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | HARRAH | OK |
| 2016-02-03 | 405-554 | 0–9 XXXall 10 · 4 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | POCASSET | OK |
| 2015-12-16 | 405-591 | 0–9 XXXall 10 · 5 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | MERIDIAN | OK |
| 2014-08-25 | 405-421 | 0–9 XXXall 10 · 3 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | OKLA CITY | OK |
| — | 405-725 | 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | LUTHER | OK |
Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.