NumberResearchRecent thousands-block assignments
13 blocks assigned in May 2026 · 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, May 2026 — NPA 858
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2026-05-29 | 858-713-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2026-05-29 | 858-713-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2026-05-22 | 858-381-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RNCHOSANFE | CA |
| 2026-05-21 | 858-393-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | DEL MAR | CA |
| 2026-05-21 | 858-426-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | EL CAJON | CA |
| 2026-05-21 | 858-445-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SNDG MRMS | CA |
| 2026-05-21 | 858-447-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | RNCHOPNQTS | CA |
| 2026-05-20 | 858-338-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | HARBSNALPN | CA |
| 2026-05-20 | 858-881-1XXX | 1000–1999 | Assigned | 8X8, INC. | 193E | SNDG SNDG | CA |
| 2026-05-08 | 858-443-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | CHULAVISTA | CA |
| 2026-05-08 | 858-443-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | CHULAVISTA | CA |
| 2026-05-08 | 858-443-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | CHULAVISTA | CA |
| 2026-05-08 | 858-443-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | CHULAVISTA | CA |
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.