NumberResearchThousands-blocks in 313-651
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 313-651 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
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| — | 313-651-0XXX | 0000–0999 | Available | DETROITZN4 | MI | ||
| 2006-09-07 | 313-651-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | DETROITZN4 | MI |
| — | 313-651-2XXX | 2000–2999 | Available | DETROITZN4 | MI | ||
| 2005-04-08 | 313-651-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | DETROITZN4 | MI |
| 2011-12-16 | 313-651-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN4 | MI |
| 2008-02-20 | 313-651-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN4 | MI |
| 2006-06-22 | 313-651-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | DETROITZN4 | MI |
| 2006-09-07 | 313-651-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | DETROITZN4 | MI |
| 2006-08-07 | 313-651-8XXX | 8000–8999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | DETROITZN4 | MI |
| 2008-02-20 | 313-651-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN4 | 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.