NumberResearchThousands-blocks in 405-338
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 405-338 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 405 blocks
Most active assignees, all time — NPA 405
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-10-04 | 405-338-0XXX | 0000–0999 | Assigned | TERRA NOVA TELECOM INC. | 145J | STILLWATER | OK |
| 2014-12-26 | 405-338-1XXX | 1000–1999 | Assigned | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | STILLWATER | OK |
| 2012-09-25 | 405-338-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | STILLWATER | OK |
| 2012-09-25 | 405-338-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | STILLWATER | OK |
| 2017-03-09 | 405-338-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | STILLWATER | OK |
| 2008-09-05 | 405-338-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | STILLWATER | OK |
| 2014-09-16 | 405-338-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - OK | 5257 | STILLWATER | OK |
| 2015-04-07 | 405-338-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - OK | 119F | STILLWATER | OK |
| 2007-06-15 | 405-338-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | STILLWATER | OK |
| 2014-06-19 | 405-338-9XXX | 9000–9999 | Assigned | CSC VOICE, LLC | 612K | STILLWATER | OK |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.