NumberResearchRecent thousands-block assignments
4 blocks assigned in March 2026 · 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, March 2026 — NPA 773
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-03-23 | 773-597-0XXX | 0000–0999 | Assigned | BOOST SUBSCRIBERCO L.L.C. | 490J | CHICGOZN07 | IL |
| 2026-03-02 | 773-448-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | CHICGOZN07 | IL |
| 2026-03-02 | 773-690-6XXX | 6000–6999 | Assigned | ONVOY, LLC | 224C | CHICGOZN07 | IL |
| 2026-03-02 | 773-740-5XXX | 5000–5999 | Assigned | ONVOY, LLC | 224C | CHICGOZN02 | IL |
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.