NumberResearchThousands-blocks in 608-623
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 608-623 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 |
|---|---|---|---|---|---|---|---|
| 2006-12-27 | 608-623-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | COBB | WI |
| 2024-01-18 | 608-623-1XXX | 1000–1999 | Assigned | MH TELECOM, INC. - WI | 3043 | COBB | WI |
| — | 608-623-2XXX | 2000–2999 | Reserved | FRONTIER NORTH INC. - WI | 0886 | COBB | WI |
| — | 608-623-3XXX | 3000–3999 | Reserved | FRONTIER NORTH INC. - WI | 0886 | COBB | WI |
| 2021-05-26 | 608-623-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | COBB | WI |
| 2021-07-01 | 608-623-5XXX | 5000–5999 | Assigned | ONVOY, LLC - WI | 225C | COBB | WI |
| 2020-04-03 | 608-623-6XXX | 6000–6999 | Assigned | ONVOY, LLC - WI | 225C | COBB | WI |
| 2014-11-24 | 608-623-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | COBB | WI |
| 2021-03-08 | 608-623-8XXX | 8000–8999 | Assigned | ONVOY, LLC - WI | 225C | COBB | WI |
| 2025-07-17 | 608-623-9XXX | 9000–9999 | Assigned | TERRA NOVA TELECOM INC. | 145J | COBB | 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.