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 510
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 |
|---|---|---|---|---|---|---|---|
| 2021-09-30 | 510-596-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2021-08-19 | 510-973-1XXX | 1000–1999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2021-08-13 | 510-904-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD TRNID | CA |
| 2021-08-11 | 510-973-3XXX | 3000–3999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2021-06-17 | 510-973-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2021-05-07 | 510-947-4XXX | 4000–4999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2021-04-06 | 510-903-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2021-03-09 | 510-973-0XXX | 0000–0999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2020-11-25 | 510-380-0XXX | 0000–0999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2020-08-11 | 510-768-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2020-08-11 | 510-977-1XXX | 1000–1999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2020-06-29 | 510-977-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2020-06-02 | 510-607-7XXX | 7000–7999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2018-12-07 | 510-725-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2018-12-07 | 510-920-3XXX | 3000–3999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2018-10-16 | 510-616-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2018-07-18 | 510-989-1XXX | 1000–1999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2018-06-12 | 510-989-9XXX | 9000–9999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2018-06-07 | 510-570-8XXX | 8000–8999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2018-03-19 | 510-920-0XXX | 0000–0999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2018-01-23 | 510-947-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2017-12-22 | 510-947-9XXX | 9000–9999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2017-12-18 | 510-616-0XXX | 0000–0999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2017-12-18 | 510-616-1XXX | 1000–1999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2017-12-18 | 510-616-2XXX | 2000–2999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2016-03-01 | 510-740-9XXX | 9000–9999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2013-05-08 | 510-210-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | RICHMOND | CA |
| 2013-05-08 | 510-598-1XXX | 1000–1999 | Assigned | SONIC TELECOM, LLC - CA | 433E | FRNK MAIN | CA |
| 2012-11-28 | 510-324-7XXX | 7000–7999 | Assigned | SONIC TELECOM, LLC - CA | 433E | FRNK GRNLF | CA |
| 2012-11-28 | 510-398-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | HAYWARD | CA |
| 2012-11-28 | 510-775-7XXX | 7000–7999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD ALMD | CA |
| 2012-11-28 | 510-990-8XXX | 8000–8999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD BKLY | CA |
| 2012-11-19 | 510-269-1XXX | 1000–1999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD FRTVL | CA |
| 2012-11-19 | 510-788-7XXX | 7000–7999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD MN-PD | CA |
| 2012-11-19 | 510-924-5XXX | 5000–5999 | Assigned | SONIC TELECOM, LLC - CA | 433E | OKLD TRNID | CA |
| 2012-11-12 | 510-413-6XXX | 6000–6999 | Assigned | SONIC TELECOM, LLC - CA | 433E | FRNK OLIVR | CA |
| 2012-11-12 | 510-815-7XXX | 7000–7999 | Assigned | SONIC TELECOM, LLC - CA | 433E | ELSBR-PINL | 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.