NumberResearchRecent thousands-block assignments
0 blocks assigned in the last 30 days · 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, all time — NPA 628
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-04-07 | 628-258-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | NICASIO | CA |
| 2021-04-07 | 628-348-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BELVEDERE | CA |
| 2021-04-07 | 628-432-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SNFC MT-EV | CA |
| 2021-04-07 | 628-433-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | IGNACIO | CA |
| 2021-04-07 | 628-477-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | MILLVALLEY | CA |
| 2021-04-07 | 628-667-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SAN RAFAEL | CA |
| 2021-04-07 | 628-766-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | STNSN-BLNS | CA |
| 2021-04-07 | 628-786-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | SNFC JUNPR | CA |
| 2017-11-06 | 628-251-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SNFC CNTRL | CA |
| 2017-01-13 | 628-212-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | CORTEMADRA | CA |
| 2017-01-13 | 628-216-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | POINTREYES | CA |
| 2016-08-16 | 628-201-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | SNFC CNTRL | CA |
| 2016-08-16 | 628-207-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | SNFC MT-EV | CA |
| 2016-08-16 | 628-229-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | POINTREYES | CA |
| 2016-08-16 | 628-237-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | SAUSALITO | CA |
| 2016-08-16 | 628-239-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | SNFC JUNPR | CA |
| 2016-08-15 | 628-202-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | BELVEDERE | CA |
| 2016-08-15 | 628-204-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | NICASIO | CA |
| 2016-08-15 | 628-232-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | INVERNESS | CA |
| 2016-08-15 | 628-238-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | IGNACIO | CA |
| 2016-08-15 | 628-245-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | MILLVALLEY | CA |
| 2016-08-15 | 628-252-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CORTEMADRA | CA |
| 2016-07-05 | 628-202-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | BELVEDERE | CA |
| 2015-10-07 | 628-234-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SAN RAFAEL | CA |
| 2015-07-01 | 628-200-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | SNFC JUNPR | CA |
| 2015-07-01 | 628-777-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | SNFC MT-EV | 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.