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 307
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2025-10-22 | 307-449-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | ROCK SPG | WY |
| 2025-10-22 | 307-449-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | ROCK SPG | WY |
| 2025-10-22 | 307-474-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | CODY | WY |
| 2025-10-22 | 307-474-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | CODY | WY |
| 2020-10-09 | 307-292-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | CHEYENNE | WY |
| 2020-10-09 | 307-292-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | CHEYENNE | WY |
| 2020-09-10 | 307-302-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | CODY | WY |
| 2020-09-03 | 307-522-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | ROCK SPG | WY |
| 2020-06-18 | 307-292-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | CHEYENNE | WY |
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.