NumberResearchThousands-blocks in 608-666
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 608-666 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 608 blocks
Most active assignees, all time — NPA 608
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 608-666-0XXX | 0000–0999 | Available | LYNDON STA | WI | ||
| — | 608-666-1XXX | 1000–1999 | Available | LYNDON STA | WI | ||
| — | 608-666-2XXX | 2000–2999 | Reserved | FRONTIER NORTH INC. - WI | 0886 | LYNDON STA | WI |
| — | 608-666-3XXX | 3000–3999 | Available | LYNDON STA | WI | ||
| 2021-08-10 | 608-666-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | LYNDON STA | WI |
| 2008-08-20 | 608-666-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | LYNDON STA | WI |
| 2020-02-27 | 608-666-6XXX | 6000–6999 | Assigned | FRACTEL, LLC | 965H | LYNDON STA | WI |
| 2014-11-25 | 608-666-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LYNDON STA | WI |
| 2021-05-26 | 608-666-8XXX | 8000–8999 | Assigned | ONVOY SPECTRUM, LLC | 624H | LYNDON STA | WI |
| 2025-06-30 | 608-666-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | LYNDON STA | WI |
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.