NumberResearchThousands-blocks in 608-478
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 608-478 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 608-478-0XXX | 0000–0999 | Reserved | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | SUNPRAIRIE | WI |
| 2018-08-13 | 608-478-1XXX | 1000–1999 | Assigned | TDS METROCOM, LLC | 520K | SUNPRAIRIE | WI |
| 2011-11-10 | 608-478-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | SUNPRAIRIE | WI |
| 2011-08-05 | 608-478-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | SUNPRAIRIE | WI |
| 2014-09-04 | 608-478-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | SUNPRAIRIE | WI |
| 2017-05-05 | 608-478-5XXX | 5000–5999 | Assigned | TDS METROCOM, LLC | 520K | SUNPRAIRIE | WI |
| 2011-05-25 | 608-478-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | SUNPRAIRIE | WI |
| 2020-04-07 | 608-478-7XXX | 7000–7999 | Assigned | ONVOY, LLC - WI | 225C | SUNPRAIRIE | WI |
| 2024-02-09 | 608-478-8XXX | 8000–8999 | Assigned | ONVOY, LLC - WI | 225C | SUNPRAIRIE | WI |
| 2023-05-02 | 608-478-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SUNPRAIRIE | 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.