NumberResearchThousands-blocks in 608-737
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 608-737 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 |
|---|---|---|---|---|---|---|---|
| — | 608-737-0XXX | 0000–0999 | Available | NO FREEDOM | WI | ||
| 2008-02-20 | 608-737-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | NO FREEDOM | WI |
| — | 608-737-2XXX | 2000–2999 | Available | NO FREEDOM | WI | ||
| 2019-07-31 | 608-737-3XXX | 3000–3999 | Assigned | ONVOY, LLC - WI | 225C | NO FREEDOM | WI |
| 2021-03-08 | 608-737-4XXX | 4000–4999 | Assigned | ONVOY, LLC - WI | 225C | NO FREEDOM | WI |
| — | 608-737-5XXX | 5000–5999 | Available | NO FREEDOM | WI | ||
| — | 608-737-6XXX | 6000–6999 | Available | NO FREEDOM | WI | ||
| 2014-11-03 | 608-737-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - WI | 5489 | NO FREEDOM | WI |
| 2021-08-10 | 608-737-8XXX | 8000–8999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | NO FREEDOM | WI |
| 2020-02-03 | 608-737-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - WI | 007F | NO FREEDOM | 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.