NumberResearchRecent thousands-block assignments
2 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 586
New assignments by month
Sep 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-11-15 | 586-837-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | UTICA | MI |
| 2022-11-15 | 586-838-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | WARREN | MI |
| 2022-11-14 | 586-239-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-11-14 | 586-723-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-11-14 | 586-913-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-11-14 | 586-926-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | WASHINGTON | MI |
| 2022-11-14 | 586-926-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | WASHINGTON | MI |
| 2022-11-02 | 586-325-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | NEWBALTIMR | MI |
| 2022-11-01 | 586-318-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-11-01 | 586-318-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-11-01 | 586-318-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-11-01 | 586-318-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-11-01 | 586-360-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | ROSEVILLE | MI |
| 2022-11-01 | 586-420-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | ROSEVILLE | MI |
| 2022-11-01 | 586-420-7XXX | 7000–7999 | Assigned | ONVOY, LLCV - MI | 543C | ROSEVILLE | MI |
| 2022-11-01 | 586-420-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | ROSEVILLE | MI |
| 2022-10-05 | 586-301-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARREN | MI |
| 2022-10-05 | 586-301-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARREN | MI |
| 2022-10-05 | 586-301-3XXX | 3000–3999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARREN | MI |
| 2022-10-05 | 586-301-4XXX | 4000–4999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARREN | MI |
| 2022-09-14 | 586-310-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MT CLEMENS | MI |
| 2022-09-14 | 586-310-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MT CLEMENS | MI |
| 2022-09-14 | 586-421-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MT CLEMENS | MI |
| 2022-09-01 | 586-325-2XXX | 2000–2999 | Assigned | ONVOY, LLCV - MI | 543C | NEWBALTIMR | MI |
| 2022-09-01 | 586-325-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | NEWBALTIMR | MI |
| 2022-09-01 | 586-496-1XXX | 1000–1999 | Assigned | ONVOY, LLCV - MI | 543C | ROSEVILLE | MI |
| 2022-09-01 | 586-496-6XXX | 6000–6999 | Assigned | ONVOY, LLCV - MI | 543C | ROSEVILLE | MI |
| 2022-08-08 | 586-318-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-08-08 | 586-318-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-08-03 | 586-742-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ROSEVILLE | MI |
| 2022-07-22 | 586-310-3XXX | 3000–3999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-07-22 | 586-310-4XXX | 4000–4999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-07-22 | 586-310-5XXX | 5000–5999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-07-22 | 586-310-7XXX | 7000–7999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2022-07-06 | 586-837-1XXX | 1000–1999 | Assigned | COMCAST IP PHONE, LLC | 318J | UTICA | MI |
| 2022-07-06 | 586-837-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | UTICA | MI |
| 2022-06-29 | 586-310-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | MT CLEMENS | MI |
| 2022-06-09 | 586-328-1XXX | 1000–1999 | Assigned | VONAGE AMERICA LLC | 197D | WARREN | MI |
| 2022-05-23 | 586-318-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROMEO | MI |
| 2022-04-15 | 586-278-0XXX | 0000–0999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CENTERLINE | MI |
| 2022-04-08 | 586-486-1XXX | 1000–1999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CENTERLINE | MI |
| 2022-03-17 | 586-278-1XXX | 1000–1999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CENTERLINE | MI |
| 2022-03-02 | 586-742-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ROSEVILLE | MI |
| 2022-02-28 | 586-926-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | WASHINGTON | MI |
| 2022-02-24 | 586-742-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ROSEVILLE | MI |
| 2022-02-24 | 586-837-4XXX | 4000–4999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | UTICA | MI |
| 2022-01-24 | 586-785-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | ROMEO | MI |
| 2022-01-06 | 586-278-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CENTERLINE | MI |
| 2022-01-06 | 586-278-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | CENTERLINE | MI |
| 2022-01-06 | 586-325-3XXX | 3000–3999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | NEWBALTIMR | 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.