NumberResearchThousands-blocks in 608-312
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 608-312 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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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2007-05-21 | 608-312-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| — | 608-312-1XXX | 1000–1999 | Reserved | METROPCS, INC. | 5562 | BELOIT | WI |
| 2005-12-13 | 608-312-2XXX | 2000–2999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BELOIT | WI |
| — | 608-312-3XXX | 3000–3999 | Reserved | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| 2014-02-25 | 608-312-4XXX | 4000–4999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BELOIT | WI |
| 2016-08-17 | 608-312-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| 2016-12-05 | 608-312-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| 2014-11-20 | 608-312-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BELOIT | WI |
| 2005-01-03 | 608-312-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BELOIT | WI |
| — | 608-312-9XXX | 9000–9999 | Reserved | T-MOBILE USA, INC. | 6529 | BELOIT | 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.