NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 231
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2019-12-05 | 231-212-0XXX | 0000–0999 | Assigned | 123.NET, LLC | 2550 | INTERLOCHN | MI |
| 2016-10-10 | 231-221-1XXX | 1000–1999 | Assigned | 123.NET, LLC | 2550 | HARBOR SPG | MI |
| 2015-12-24 | 231-259-2XXX | 2000–2999 | Assigned | 123.NET, LLC | 2550 | SHELBY | MI |
| 2012-05-04 | 231-536-6XXX | 6000–6999 | Assigned | 123.NET, LLC | 2550 | EASTJORDAN | MI |
| 2009-10-30 | 231-220-2XXX | 2000–2999 | Assigned | 123.NET, LLC | 2550 | MUSKEGON | MI |
| 2009-01-28 | 231-791-7XXX | 7000–7999 | Assigned | 123.NET, LLC | 2550 | REED CITY | MI |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.