NumberResearchRecent thousands-block assignments
7 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 231
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 |
|---|---|---|---|---|---|---|---|
| 2015-08-12 | 231-676-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BELLAIRE | MI |
| 2015-08-12 | 231-768-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LE ROY | MI |
| 2015-08-12 | 231-821-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOLTON | MI |
| 2015-08-12 | 231-844-2XXX | 2000–2999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | INDIAN RIV | MI |
| 2015-08-03 | 231-331-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | ALDEN | MI |
| 2015-08-03 | 231-331-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | ALDEN | MI |
| 2015-08-03 | 231-440-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | BALDWIN | MI |
| 2015-08-03 | 231-642-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | TRAVERSECY | MI |
| 2015-08-03 | 231-642-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | TRAVERSECY | MI |
| 2015-07-31 | 231-303-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | NEWAYGO | MI |
| 2015-07-30 | 231-799-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | MUSKEGON | MI |
| 2015-07-28 | 231-726-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MUSKEGON | MI |
| 2015-07-20 | 231-266-0XXX | 0000–0999 | Assigned | ONVOY, LLCV - MI | 543C | IRONS | MI |
| 2015-07-20 | 231-303-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | NEWAYGO | MI |
| 2015-07-20 | 231-388-7XXX | 7000–7999 | Assigned | ONVOY, LLCV - MI | 543C | LE ROY | MI |
| 2015-07-20 | 231-440-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | BALDWIN | MI |
| 2015-07-20 | 231-462-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | FOUNTAIN | MI |
| 2015-07-20 | 231-508-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | ONEKAMA | MI |
| 2015-07-20 | 231-515-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | EVART | MI |
| 2015-07-20 | 231-667-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | MARION | MI |
| 2015-07-20 | 231-797-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | LUTHER | MI |
| 2015-07-13 | 231-295-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LAKE CITY | MI |
| 2015-06-25 | 231-375-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MUSKEGON | MI |
| 2015-06-25 | 231-835-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | GLEN LAKE | MI |
| 2015-06-18 | 231-888-7XXX | 7000–7999 | Assigned | ONVOY, LLCV - MI | 543C | TWIN LAKE | MI |
| 2015-06-18 | 231-888-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | TWIN LAKE | MI |
| 2015-06-11 | 231-715-4XXX | 4000–4999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - MI | 770E | TRAVERSECY | MI |
| 2015-06-02 | 231-221-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HARBOR SPG | MI |
| 2015-06-02 | 231-399-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | FRANKFORT | MI |
| 2015-05-29 | 231-751-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF MICHIGAN, LLC - MI | 933G | WALLOON LK | MI |
| 2015-05-19 | 231-833-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | WOLVERINE | MI |
| 2015-05-19 | 231-833-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | WOLVERINE | MI |
| 2015-05-19 | 231-833-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | WOLVERINE | MI |
| 2015-05-15 | 231-425-9XXX | 9000–9999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | LUDINGTON | MI |
| 2015-05-15 | 231-642-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | TRAVERSECY | MI |
| 2015-04-27 | 231-427-1XXX | 1000–1999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | MACKINAWCY | MI |
| 2015-04-21 | 231-489-0XXX | 0000–0999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | PETOSKEY | MI |
| 2015-04-20 | 231-497-6XXX | 6000–6999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | BOYNE CITY | MI |
| 2015-03-26 | 231-213-0XXX | 0000–0999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-1XXX | 1000–1999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-2XXX | 2000–2999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-3XXX | 3000–3999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-4XXX | 4000–4999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-5XXX | 5000–5999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-6XXX | 6000–6999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-7XXX | 7000–7999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-8XXX | 8000–8999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-26 | 231-213-9XXX | 9000–9999 | Assigned | MICHIGAN BELL TEL CO | 9323 | TRAVERSECY | MI |
| 2015-03-17 | 231-375-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | MUSKEGON | MI |
| 2015-02-06 | 231-412-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - MI | 991E | HARBOR SPG | 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.