NumberResearchThousands-blocks in 608-566
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 608-566 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
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2006-05-24 | 608-566-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | PORTAGE | WI |
| 2004-12-22 | 608-566-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | PORTAGE | WI |
| 2005-12-12 | 608-566-2XXX | 2000–2999 | Assigned | TDS METROCOM, LLC | 520K | PORTAGE | WI |
| 2006-12-28 | 608-566-3XXX | 3000–3999 | Assigned | UNITED STATES CELLULAR - WI | 6274 | PORTAGE | WI |
| 2010-03-30 | 608-566-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | PORTAGE | WI |
| 2004-10-08 | 608-566-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTAGE | WI |
| 2007-08-29 | 608-566-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTAGE | WI |
| 2010-10-18 | 608-566-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI | 6508 | PORTAGE | WI |
| 2011-05-10 | 608-566-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | PORTAGE | WI |
| — | 608-566-9XXX | 9000–9999 | Reserved | T-MOBILE USA, INC. | 6529 | PORTAGE | 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.