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 510
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
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Apr 2026
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Dec 2025
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2021-04-07 | 510-293-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | HAYWARD | CA |
| 2021-04-07 | 510-832-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | OKLD MN-PD | CA |
| 2016-08-16 | 510-399-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | FRNK MAIN | CA |
| 2016-08-16 | 510-424-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | OKLD FRTVL | CA |
| 2016-08-16 | 510-462-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | FRNK GRNLF | CA |
| 2016-08-16 | 510-464-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | OKLD MN-PD | CA |
| 2016-08-16 | 510-626-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | OKLD TRNID | CA |
| 2016-08-16 | 510-640-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | ELSBR-PINL | CA |
| 2016-08-16 | 510-806-0XXX | 0000–0999 | Assigned | IP HORIZON LLC | 515J | RICHMOND | CA |
| 2016-08-16 | 510-901-6XXX | 6000–6999 | Assigned | IP HORIZON LLC | 515J | HAYWARD | CA |
| 2016-08-16 | 510-906-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | OKLD ALMD | CA |
| 2016-08-16 | 510-937-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | CROCKETT | CA |
| 2016-08-16 | 510-939-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | HRCUL-RODE | CA |
| 2016-08-16 | 510-993-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | OKLD BKLY | CA |
| 2015-09-04 | 510-937-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | CROCKETT | CA |
| 2014-03-14 | 510-671-9XXX | 9000–9999 | Assigned | IP HORIZON LLC | 515J | OKLD ALMD | CA |
| 2013-07-31 | 510-423-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | OKLD BKLY | CA |
| 2003-09-19 | 510-214-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | OKLD ALMD | CA |
| 2003-09-19 | 510-229-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | OKLD BKLY | CA |
| 2003-09-19 | 510-240-7XXX | 7000–7999 | Assigned | IP HORIZON LLC | 515J | FRNK GRNLF | CA |
| 2003-09-19 | 510-257-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | FRNK OLIVR | CA |
| 2003-09-19 | 510-257-3XXX | 3000–3999 | Assigned | IP HORIZON LLC | 515J | FRNK OLIVR | CA |
| 2003-09-19 | 510-269-8XXX | 8000–8999 | Assigned | IP HORIZON LLC | 515J | OKLD FRTVL | CA |
| 2003-09-19 | 510-296-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | HRCUL-RODE | CA |
| 2003-09-19 | 510-296-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | HRCUL-RODE | CA |
| 2003-09-19 | 510-686-4XXX | 4000–4999 | Assigned | IP HORIZON LLC | 515J | OKLD TRNID | CA |
| 2002-09-17 | 510-256-5XXX | 5000–5999 | Assigned | IP HORIZON LLC | 515J | CROCKETT | CA |
| 2002-09-17 | 510-260-2XXX | 2000–2999 | Assigned | IP HORIZON LLC | 515J | RICHMOND | 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.