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 |
|---|---|---|---|---|---|---|---|
| 2013-02-08 | 231-480-2XXX | 2000–2999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | LUDINGTON | MI |
| 2005-11-07 | 231-672-2XXX | 2000–2999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | MUSKEGON | MI |
| 2005-11-07 | 231-672-3XXX | 3000–3999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | MUSKEGON | MI |
| 2005-11-07 | 231-672-4XXX | 4000–4999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | MUSKEGON | MI |
| 2005-11-07 | 231-672-6XXX | 6000–6999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | MUSKEGON | MI |
| 2005-11-07 | 231-672-7XXX | 7000–7999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | MUSKEGON | MI |
| 2005-11-07 | 231-672-8XXX | 8000–8999 | Assigned | FRONTIER NORTH, INC. - MI | 0695 | MUSKEGON | 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.