NumberResearchThousands-blocks in 608-399
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 608-399 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 |
|---|---|---|---|---|---|---|---|
| — | 608-399-0XXX | 0000–0999 | Reserved | BRIGHTSPEED OF CENTRAL WISCONSIN, LLC | 1159 | HOLMEN | WI |
| 2005-11-28 | 608-399-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HOLMEN | WI |
| 2006-09-05 | 608-399-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | HOLMEN | WI |
| 2012-05-01 | 608-399-3XXX | 3000–3999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | HOLMEN | WI |
| 2007-03-01 | 608-399-4XXX | 4000–4999 | Assigned | UNITED STATES CELLULAR - WI | 6274 | HOLMEN | WI |
| 2014-10-23 | 608-399-5XXX | 5000–5999 | Assigned | UNITED STATES CELLULAR - WI | 6274 | HOLMEN | WI |
| 2013-11-20 | 608-399-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC | 7229 | HOLMEN | WI |
| 2014-11-03 | 608-399-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOLMEN | WI |
| 2016-04-28 | 608-399-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HOLMEN | WI |
| 2016-04-28 | 608-399-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | HOLMEN | 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.