NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/22/2026
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, all time — 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 |
|---|---|---|---|---|---|---|---|
| 2017-06-29 | 586-676-9XXX | 9000–9999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | MT CLEMENS | MI |
| 2016-10-10 | 586-251-1XXX | 1000–1999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | UTICA | MI |
| 2016-10-10 | 586-267-9XXX | 9000–9999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | MT CLEMENS | MI |
| 2016-10-10 | 586-571-1XXX | 1000–1999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | CENTERLINE | MI |
| 2015-03-03 | 586-459-9XXX | 9000–9999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | CENTERLINE | MI |
| 2014-08-28 | 586-843-1XXX | 1000–1999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | UTICA | MI |
| 2011-01-19 | 586-248-9XXX | 9000–9999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | RICHMOND | MI |
| 2010-09-21 | 586-648-5XXX | 5000–5999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | NEWBALTIMR | MI |
| 2006-08-07 | 586-276-9XXX | 9000–9999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | WARREN | MI |
| 2006-08-07 | 586-350-2XXX | 2000–2999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | ROSEVILLE | MI |
| 2006-08-07 | 586-372-3XXX | 3000–3999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | ROMEO | MI |
| 2006-08-07 | 586-619-3XXX | 3000–3999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | CENTERLINE | MI |
| 2006-08-07 | 586-649-6XXX | 6000–6999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | MT CLEMENS | MI |
| 2006-08-07 | 586-884-5XXX | 5000–5999 | Assigned | GRID 4 COMMUNICATIONS, INC. - MI | 9714 | UTICA | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.