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 |
|---|---|---|---|---|---|---|---|
| 2014-02-03 | 510-987-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | OKLD MN-PD | CA |
| 2012-11-30 | 510-454-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-11-30 | 510-454-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-11-30 | 510-454-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-11-30 | 510-454-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-11-30 | 510-454-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-11-30 | 510-454-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-11-30 | 510-454-7XXX | 7000–7999 | Assigned | PACIFIC BELL | 9740 | OKLD TRNID | CA |
| 2012-01-13 | 510-294-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2012-01-13 | 510-294-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2012-01-13 | 510-294-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2012-01-13 | 510-294-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2012-01-13 | 510-294-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2012-01-13 | 510-294-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2012-01-13 | 510-294-7XXX | 7000–7999 | Assigned | PACIFIC BELL | 9740 | HAYWARD | CA |
| 2009-11-25 | 510-408-0XXX | 0000–0999 | Assigned | PACIFIC BELL | 9740 | ELSBR-PINL | CA |
| 2009-11-25 | 510-408-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | ELSBR-PINL | CA |
| 2009-11-25 | 510-408-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | ELSBR-PINL | CA |
| 2009-11-25 | 510-408-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | ELSBR-PINL | CA |
| 2009-11-25 | 510-408-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | ELSBR-PINL | CA |
| 2009-11-25 | 510-408-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | ELSBR-PINL | CA |
| 2007-11-28 | 510-356-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | OKLD BKLY | CA |
| 2007-11-28 | 510-356-9XXX | 9000–9999 | Assigned | PACIFIC BELL | 9740 | OKLD BKLY | CA |
| 2002-06-28 | 510-248-1XXX | 1000–1999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-06-28 | 510-248-2XXX | 2000–2999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-06-28 | 510-248-3XXX | 3000–3999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-06-28 | 510-248-5XXX | 5000–5999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-06-28 | 510-248-6XXX | 6000–6999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-06-28 | 510-248-7XXX | 7000–7999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-06-28 | 510-248-8XXX | 8000–8999 | Assigned | PACIFIC BELL | 9740 | FRNK MAIN | CA |
| 2002-04-17 | 510-243-4XXX | 4000–4999 | Assigned | PACIFIC BELL | 9740 | 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.