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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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 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 |
| 2026-04-15 | 858-600-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2026-04-15 | 858-600-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2026-04-15 | 858-600-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2026-04-15 | 858-600-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2022-10-20 | 858-351-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2022-10-20 | 858-351-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2018-12-19 | 858-868-9XXX | 9000–9999 | Assigned | HD CARRIER LLC | 321J | SNDG SNDG | CA |
| 2016-09-26 | 858-250-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | LA JOLLA | CA |
| 2016-09-26 | 858-250-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | LA JOLLA | CA |
| 2016-09-26 | 858-250-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | LA JOLLA | CA |
| 2016-09-26 | 858-250-7XXX | 7000–7999 | Assigned | HD CARRIER LLC | 321J | LA JOLLA | CA |
| 2016-09-26 | 858-250-8XXX | 8000–8999 | Assigned | HD CARRIER LLC | 321J | LA JOLLA | CA |
| 2016-05-16 | 858-276-2XXX | 2000–2999 | Assigned | HD CARRIER LLC | 321J | SNDG LVTA | CA |
| 2016-05-16 | 858-276-3XXX | 3000–3999 | Assigned | HD CARRIER LLC | 321J | SNDG LVTA | CA |
| 2016-05-16 | 858-276-4XXX | 4000–4999 | Assigned | HD CARRIER LLC | 321J | SNDG LVTA | CA |
| 2016-05-16 | 858-276-5XXX | 5000–5999 | Assigned | HD CARRIER LLC | 321J | SNDG LVTA | CA |
| 2016-05-16 | 858-276-6XXX | 6000–6999 | Assigned | HD CARRIER LLC | 321J | SNDG LVTA | 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.