NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/21/2026
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 858
New assignments by month
Sep 2026
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| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2022-06-21 | 858-687-5XXX | 5000–5999 | Assigned | VONAGE AMERICA LLC | 197D | POWAY | CA |
| 2020-09-30 | 858-867-3XXX | 3000–3999 | Assigned | VONAGE AMERICA LLC | 197D | SNDG SNDG | CA |
| 2020-06-11 | 858-301-6XXX | 6000–6999 | Assigned | VONAGE AMERICA LLC | 197D | EL CAJON | CA |
| 2020-06-11 | 858-301-9XXX | 9000–9999 | Assigned | VONAGE AMERICA LLC | 197D | EL CAJON | CA |
| 2020-06-09 | 858-290-0XXX | 0000–0999 | Assigned | VONAGE AMERICA LLC | 197D | DEL MAR | CA |
| 2020-06-09 | 858-977-5XXX | 5000–5999 | Assigned | VONAGE AMERICA LLC | 197D | DEL MAR | CA |
| 2020-06-02 | 858-289-3XXX | 3000–3999 | Assigned | VONAGE AMERICA LLC | 197D | SNDG LVTA | CA |
| 2020-06-02 | 858-289-4XXX | 4000–4999 | Assigned | VONAGE AMERICA LLC | 197D | SNDG LVTA | CA |
| 2020-05-15 | 858-788-2XXX | 2000–2999 | Assigned | VONAGE AMERICA LLC | 197D | LA JOLLA | CA |
| 2020-05-15 | 858-788-3XXX | 3000–3999 | Assigned | VONAGE AMERICA LLC | 197D | LA JOLLA | CA |
| 2019-01-03 | 858-286-2XXX | 2000–2999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
| 2019-01-03 | 858-286-3XXX | 3000–3999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
| 2019-01-03 | 858-286-4XXX | 4000–4999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
| 2019-01-03 | 858-286-5XXX | 5000–5999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
| 2019-01-03 | 858-286-6XXX | 6000–6999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
| 2018-11-26 | 858-286-0XXX | 0000–0999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
| 2018-11-26 | 858-286-1XXX | 1000–1999 | Assigned | VONAGE AMERICA LLC | 197D | CHULAVISTA | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.