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
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 |
|---|---|---|---|---|---|---|---|
| 2008-08-19 | 586-552-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2008-08-06 | 586-244-0XXX | 0000–0999 | Assigned | TELNET WORLDWIDE, INC. | 817J | NEW HAVEN | MI |
| 2008-08-05 | 586-884-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - MI | 7279 | UTICA | MI |
| 2008-07-29 | 586-231-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2008-07-29 | 586-231-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2008-07-15 | 586-239-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - MI | 6120 | MT CLEMENS | MI |
| 2008-07-10 | 586-801-2XXX | 2000–2999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | ROSEVILLE | MI |
| 2008-07-02 | 586-329-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | MT CLEMENS | MI |
| 2008-07-02 | 586-339-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | NEW HAVEN | MI |
| 2008-07-02 | 586-362-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | ROSEVILLE | MI |
| 2008-07-02 | 586-362-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | ROSEVILLE | MI |
| 2008-07-02 | 586-675-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2008-07-02 | 586-675-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2008-06-24 | 586-231-0XXX | 0000–0999 | Assigned | COMCAST IP PHONE, LLC | 318J | MT CLEMENS | MI |
| 2008-06-17 | 586-329-2XXX | 2000–2999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | MT CLEMENS | MI |
| 2008-06-12 | 586-218-1XXX | 1000–1999 | Assigned | FIRST COMMUNICATIONS, LLC | 460K | ROSEVILLE | MI |
| 2008-06-12 | 586-275-1XXX | 1000–1999 | Assigned | CLEAR RATE COMMUNICATIONS, LLC | 046L | WARREN | MI |
| 2008-05-28 | 586-275-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | WARREN | MI |
| 2008-05-28 | 586-275-9XXX | 9000–9999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | WARREN | MI |
| 2008-05-14 | 586-239-7XXX | 7000–7999 | Assigned | MICHIGAN BELL TEL CO | 9323 | MT CLEMENS | MI |
| 2008-05-14 | 586-439-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | ROSEVILLE | MI |
| 2008-05-13 | 586-819-8XXX | 8000–8999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | WARREN | MI |
| 2008-04-10 | 586-239-8XXX | 8000–8999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2008-04-04 | 586-552-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2008-04-04 | 586-552-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2008-03-31 | 586-239-9XXX | 9000–9999 | Assigned | ONVOY, LLCV - MI | 543C | MT CLEMENS | MI |
| 2008-03-18 | 586-275-2XXX | 2000–2999 | Assigned | COMCAST IP PHONE, LLC | 318J | WARREN | MI |
| 2008-03-14 | 586-248-1XXX | 1000–1999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | RICHMOND | MI |
| 2008-03-14 | 586-646-0XXX | 0000–0999 | Assigned | OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC | 2964 | NEW HAVEN | MI |
| 2008-02-14 | 586-563-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | ROSEVILLE | MI |
| 2008-02-14 | 586-563-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | ROSEVILLE | MI |
| 2008-02-14 | 586-563-8XXX | 8000–8999 | Assigned | METROPCS, INC. | 5562 | ROSEVILLE | MI |
| 2008-02-13 | 586-646-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | NEW HAVEN | MI |
| 2008-02-12 | 586-416-9XXX | 9000–9999 | Assigned | 123.NET, LLC | 2550 | MT CLEMENS | MI |
| 2008-02-06 | 586-563-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2007-12-31 | 586-337-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC - IL | 6534 | ROMEO | MI |
| 2007-12-11 | 586-741-5XXX | 5000–5999 | Assigned | COMCAST IP PHONE, LLC | 318J | MT CLEMENS | MI |
| 2007-12-11 | 586-741-8XXX | 8000–8999 | Assigned | COMCAST IP PHONE, LLC | 318J | MT CLEMENS | MI |
| 2007-12-10 | 586-329-7XXX | 7000–7999 | Assigned | US XCHANGE OF MICHIGAN LLC DBA CHOICE ONE COMM MI | 8685 | MT CLEMENS | MI |
| 2007-12-10 | 586-580-6XXX | 6000–6999 | Assigned | ONVOY, LLCV - MI | 543C | UTICA | MI |
| 2007-12-07 | 586-239-2XXX | 2000–2999 | Assigned | MICHIGAN BELL TEL CO | 9323 | MT CLEMENS | MI |
| 2007-12-07 | 586-239-3XXX | 3000–3999 | Assigned | MICHIGAN BELL TEL CO | 9323 | MT CLEMENS | MI |
| 2007-12-07 | 586-239-4XXX | 4000–4999 | Assigned | MICHIGAN BELL TEL CO | 9323 | MT CLEMENS | MI |
| 2007-12-07 | 586-239-5XXX | 5000–5999 | Assigned | MICHIGAN BELL TEL CO | 9323 | MT CLEMENS | MI |
| 2007-12-07 | 586-239-6XXX | 6000–6999 | Assigned | MICHIGAN BELL TEL CO | 9323 | MT CLEMENS | MI |
| 2007-12-05 | 586-552-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2007-12-05 | 586-552-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI | 6003 | ROSEVILLE | MI |
| 2007-11-27 | 586-244-5XXX | 5000–5999 | Assigned | PAETEC ITEL, LLC | 829J | NEW HAVEN | MI |
| 2007-11-27 | 586-281-7XXX | 7000–7999 | Assigned | PAETEC ITEL, LLC | 829J | ROMEO | MI |
| 2007-11-27 | 586-716-6XXX | 6000–6999 | Assigned | PAETEC ITEL, LLC | 829J | 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.