NumberResearchThousands-blocks in 405-668
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026
The ten 1,000-number thousand-blocks inside prefix 405-668 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 |
|---|---|---|---|---|---|---|---|
| — | 405-668-0XXX | 0000–0999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FORT COBB | OK |
| 2018-12-28 | 405-668-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | FORT COBB | OK |
| 2007-09-25 | 405-668-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FORT COBB | OK |
| 2011-06-30 | 405-668-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FORT COBB | OK |
| — | 405-668-4XXX | 4000–4999 | Reserved | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FORT COBB | OK |
| 2015-04-15 | 405-668-5XXX | 5000–5999 | Assigned | AT&T ENTERPRISES, LLC | 516C | FORT COBB | OK |
| 2019-02-07 | 405-668-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA OK - LLC | 530C | FORT COBB | OK |
| 2020-06-15 | 405-668-7XXX | 7000–7999 | Assigned | ONVOY, LLC - OK | 409F | FORT COBB | OK |
| 2021-02-02 | 405-668-8XXX | 8000–8999 | Assigned | ONVOY, LLC - OK | 409F | FORT COBB | OK |
| 2016-01-26 | 405-668-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF OKLAHOMA, LLC - OK | 384H | FORT COBB | OK |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.