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 |
|---|---|---|---|---|---|---|---|
| 2015-09-22 | 231-826-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | FALMOUTH | MI |
| 2015-09-17 | 231-529-4XXX | 4000–4999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BRUTUS | MI |
| 2015-09-10 | 231-460-6XXX | 6000–6999 | Assigned | ONVOY, LLCV - MI | 543C | BIG RAPIDS | MI |
| 2015-09-10 | 231-660-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | BIG RAPIDS | MI |
| 2015-08-28 | 231-928-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | FREMONT | MI |
| 2015-08-28 | 231-999-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CENTRAL LK | MI |
| 2015-08-26 | 231-244-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BOYNE CITY | MI |
| 2015-08-25 | 231-422-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | PELLSTON | MI |
| 2015-08-25 | 231-444-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | CADILLAC | MI |
| 2015-08-25 | 231-444-5XXX | 5000–5999 | Assigned | ONVOY, LLCV - MI | 543C | CADILLAC | MI |
| 2015-08-25 | 231-999-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | CENTRAL LK | MI |
| 2015-08-25 | 231-999-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | CENTRAL LK | MI |
| 2015-08-18 | 231-203-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ALANSON | MI |
| 2015-08-18 | 231-292-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WHITEHALL | MI |
| 2015-08-18 | 231-322-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TRCHRIVBDG | MI |
| 2015-08-18 | 231-404-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | STANWOOD | MI |
| 2015-08-18 | 231-751-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WALLOON LK | MI |
| 2015-08-18 | 231-833-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | WOLVERINE | MI |
| 2015-08-18 | 231-866-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | SUTTONSBAY | MI |
| 2015-08-18 | 231-888-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | TWIN LAKE | MI |
| 2015-08-17 | 231-303-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NEWAYGO | MI |
| 2015-08-17 | 231-359-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MECOSTA | MI |
| 2015-08-17 | 231-386-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | NORTHPORT | MI |
| 2015-08-17 | 231-559-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MCBAIN | MI |
| 2015-08-17 | 231-685-8XXX | 8000–8999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | RAVENNA | MI |
| 2015-08-17 | 231-743-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MARION | MI |
| 2015-08-17 | 231-753-0XXX | 0000–0999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | PETOSKEY | MI |
| 2015-08-17 | 231-803-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MORLEY | MI |
| 2015-08-13 | 231-201-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHIPPEWALK | MI |
| 2015-08-13 | 231-264-3XXX | 3000–3999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ELK RAPIDS | MI |
| 2015-08-13 | 231-265-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CORAL | MI |
| 2015-08-13 | 231-331-9XXX | 9000–9999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ALDEN | MI |
| 2015-08-13 | 231-340-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | ELMIRA | MI |
| 2015-08-13 | 231-352-3XXX | 3000–3999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | FRANKFORT | MI |
| 2015-08-13 | 231-377-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CLAM RIVER | MI |
| 2015-08-13 | 231-484-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | EASTJORDAN | MI |
| 2015-08-13 | 231-515-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | EVART | MI |
| 2015-08-13 | 231-599-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | EASTPORT | MI |
| 2015-08-13 | 231-646-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | ELLSWORTH | MI |
| 2015-08-13 | 231-681-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | FRUITPORT | MI |
| 2015-08-13 | 231-928-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | FREMONT | MI |
| 2015-08-12 | 231-227-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | HONOR | MI |
| 2015-08-12 | 231-237-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHARLEVOIX | MI |
| 2015-08-12 | 231-256-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LKLEELANAU | MI |
| 2015-08-12 | 231-427-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MACKINAWCY | MI |
| 2015-08-12 | 231-587-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MANCELONA | MI |
| 2015-08-12 | 231-625-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHEBOYGAN | MI |
| 2015-08-12 | 231-626-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LEVERING | MI |
| 2015-08-12 | 231-636-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOWARDCITY | MI |
| 2015-08-12 | 231-674-6XXX | 6000–6999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GRANT | 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.