NumberResearchThousands-blocks in 608-580
This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/19/2026
The ten 1,000-number thousand-blocks inside prefix 608-580 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 |
|---|---|---|---|---|---|---|---|
| 2006-12-06 | 608-580-0XXX | 0000–0999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MILTON | WI |
| 2014-08-04 | 608-580-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | MILTON | WI |
| 2016-10-26 | 608-580-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MILTON | WI |
| 2017-09-25 | 608-580-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - WI | 007F | MILTON | WI |
| 2016-01-20 | 608-580-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC WI | 7216 | MILTON | WI |
| 2019-07-31 | 608-580-5XXX | 5000–5999 | Assigned | ONVOY, LLC - WI | 225C | MILTON | WI |
| 2019-05-24 | 608-580-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | MILTON | WI |
| 2014-11-03 | 608-580-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MILTON | WI |
| 2020-05-18 | 608-580-8XXX | 8000–8999 | Assigned | ONVOY, LLC - WI | 225C | MILTON | WI |
| 2021-03-08 | 608-580-9XXX | 9000–9999 | Assigned | ONVOY, LLC - WI | 225C | MILTON | WI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.