NumberResearchThousands-blocks in 313-458
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 313-458 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 313 blocks
Most active assignees, all time — NPA 313
New assignments by month
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 313-458-0XXX | 0000–0999 | Available | DETROITZN2 | MI | ||
| 2008-01-07 | 313-458-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | DETROITZN2 | MI |
| 2008-01-07 | 313-458-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | DETROITZN2 | MI |
| 2008-01-07 | 313-458-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | DETROITZN2 | MI |
| 2020-08-13 | 313-458-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | DETROITZN2 | MI |
| 2007-11-27 | 313-458-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | DETROITZN2 | MI |
| 2008-01-07 | 313-458-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | DETROITZN2 | MI |
| 2007-10-12 | 313-458-7XXX | 7000–7999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN2 | MI |
| 2007-10-12 | 313-458-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN2 | MI |
| 2008-04-10 | 313-458-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | DETROITZN2 | MI |
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.