NumberResearchRecent thousands-block assignments
6 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026
Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.
Most active assignees, last 30 days — NPA 313
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 |
|---|---|---|---|---|---|---|---|
| 2008-05-14 | 313-638-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | DETROITZN1 | MI |
| 2008-05-12 | 313-525-3XXX | 3000–3999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-05-08 | 313-525-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-05-06 | 313-681-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | DETROITZN5 | MI |
| 2008-04-15 | 313-712-2XXX | 2000–2999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-04-15 | 313-712-3XXX | 3000–3999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-04-15 | 313-712-4XXX | 4000–4999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-04-15 | 313-712-5XXX | 5000–5999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-04-15 | 313-712-7XXX | 7000–7999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-04-15 | 313-712-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | DETROITZN6 | MI |
| 2008-04-10 | 313-458-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | DETROITZN2 | MI |
| 2008-04-10 | 313-638-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | DETROITZN1 | MI |
| 2008-03-31 | 313-883-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | DETROITZN3 | MI |
| 2008-03-28 | 313-915-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | DETROITZN4 | MI |
| 2008-03-27 | 313-638-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN1 | MI |
| 2008-03-27 | 313-638-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN1 | MI |
| 2008-03-19 | 313-270-9XXX | 9000–9999 | Assigned | 123.NET, LLC | 2550 | DETROITZN4 | MI |
| 2008-03-04 | 313-305-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN3 | MI |
| 2008-02-22 | 313-647-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN2 | MI |
| 2008-02-22 | 313-821-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN2 | MI |
| 2008-02-21 | 313-471-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-21 | 313-576-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-21 | 313-629-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-21 | 313-656-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-21 | 313-728-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-21 | 313-728-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-21 | 313-742-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-21 | 313-742-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-21 | 313-854-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | DETROITZN6 | MI |
| 2008-02-21 | 313-854-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | DETROITZN6 | MI |
| 2008-02-21 | 313-854-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | DETROITZN6 | MI |
| 2008-02-21 | 313-914-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | DETROITZN6 | MI |
| 2008-02-21 | 313-914-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | DETROITZN6 | MI |
| 2008-02-21 | 313-948-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-21 | 313-948-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-20 | 313-397-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN4 | MI |
| 2008-02-20 | 313-651-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN4 | MI |
| 2008-02-20 | 313-651-9XXX | 9000–9999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN4 | MI |
| 2008-02-20 | 313-739-6XXX | 6000–6999 | Assigned | COMCAST IP PHONE, LLC | 318J | DETROITZN4 | MI |
| 2008-02-15 | 313-463-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-15 | 313-463-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-15 | 313-465-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-15 | 313-465-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-15 | 313-465-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | DETROITZN1 | MI |
| 2008-02-15 | 313-687-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-15 | 313-687-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-15 | 313-687-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-15 | 313-687-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-15 | 313-687-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | DETROITZN5 | MI |
| 2008-02-15 | 313-854-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | DETROITZN6 | 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.