NumberResearchRecent thousands-block assignments
0 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, all time — NPA 231
New assignments by month
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-11-29 | 231-396-2XXX | 2000–2999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | CADILLAC | MI |
| 2021-12-21 | 231-401-0XXX | 0000–0999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | TRAVERSECY | MI |
| 2021-06-28 | 231-284-0XXX | 0000–0999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | MANISTEE | MI |
| 2019-02-28 | 231-257-0XXX | 0000–0999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | LAKE CITY | MI |
| 2019-01-03 | 231-261-0XXX | 0000–0999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | LUDINGTON | MI |
| 2018-11-15 | 231-624-9XXX | 9000–9999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | KALKASKA | MI |
| 2015-04-27 | 231-427-1XXX | 1000–1999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | MACKINAWCY | MI |
| 2015-04-21 | 231-489-0XXX | 0000–0999 | Assigned | PENINSULA FIBER NETWORK, LLC - MI | 116F | PETOSKEY | 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.