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 831
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-05-20 | 831-881-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | MONTEREY | CA |
| 2026-05-20 | 831-881-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | MONTEREY | CA |
| 2026-05-20 | 831-881-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | MONTEREY | CA |
| 2024-06-20 | 831-859-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | SALINAS | CA |
| 2024-06-20 | 831-859-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | SALINAS | CA |
| 2020-10-02 | 831-215-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | MONTEREY | CA |
| 2020-10-02 | 831-215-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | MONTEREY | CA |
| 2016-09-28 | 831-322-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | WATSONVL | CA |
| 2016-05-20 | 831-999-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-20 | 831-999-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-20 | 831-999-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-16 | 831-777-0XXX | 0000–0999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
| 2016-05-16 | 831-777-1XXX | 1000–1999 | Assigned | HD CARRIER LLC | 321J | SANTA CRUZ | CA |
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.