NumberResearchRecent thousands-block assignments
4 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, last 30 days — NPA 510
New assignments by month
Sep 2026
Aug 2026
Jul 2026
Jun 2026
May 2026
Apr 2026
Mar 2026
Feb 2026
Jan 2026
Dec 2025
Nov 2025
Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2015-03-26 | 510-939-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HRCUL-RODE | CA |
| 2015-03-26 | 510-939-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | HRCUL-RODE | CA |
| 2015-03-20 | 510-458-2XXX | 2000–2999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | FRNK MAIN | CA |
| 2015-03-20 | 510-556-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | FRNK MAIN | CA |
| 2015-03-13 | 510-309-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-03-13 | 510-309-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-03-13 | 510-309-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-03-12 | 510-934-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-12 | 510-934-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-12 | 510-934-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-12 | 510-934-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-12 | 510-934-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-09 | 510-361-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2015-03-09 | 510-361-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2015-03-09 | 510-361-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HAYWARD | CA |
| 2015-03-06 | 510-838-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-06 | 510-838-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-03-02 | 510-897-0XXX | 0000–0999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | FRNK OLIVR | CA |
| 2015-02-27 | 510-753-2XXX | 2000–2999 | Assigned | METROPCS, INC. | 5562 | OKLD TRNID | CA |
| 2015-02-27 | 510-753-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | OKLD TRNID | CA |
| 2015-02-25 | 510-753-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2015-02-25 | 510-753-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2015-02-25 | 510-753-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2015-02-24 | 510-601-2XXX | 2000–2999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | OKLD MN-PD | CA |
| 2015-02-24 | 510-735-3XXX | 3000–3999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | OKLD MN-PD | CA |
| 2015-02-19 | 510-309-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-02-19 | 510-309-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-02-19 | 510-309-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-02-17 | 510-844-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | OKLD MN-PD | CA |
| 2015-02-03 | 510-944-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2015-02-03 | 510-944-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2015-02-03 | 510-944-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2015-01-22 | 510-838-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2015-01-19 | 510-753-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD TRNID | CA |
| 2015-01-16 | 510-455-3XXX | 3000–3999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CROCKETT | CA |
| 2015-01-16 | 510-944-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2015-01-16 | 510-944-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD BKLY | CA |
| 2015-01-09 | 510-309-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2015-01-09 | 510-309-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ELSBR-PINL | CA |
| 2014-12-31 | 510-851-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | OKLD MN-PD | CA |
| 2014-12-26 | 510-361-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | HAYWARD | CA |
| 2014-12-22 | 510-771-9XXX | 9000–9999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FRNK OLIVR | CA |
| 2014-12-10 | 510-838-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | OKLD FRTVL | CA |
| 2014-12-09 | 510-829-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RICHMOND | CA |
| 2014-12-08 | 510-458-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | FRNK MAIN | CA |
| 2014-12-08 | 510-694-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | OKLD ALMD | CA |
| 2014-12-08 | 510-694-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | OKLD ALMD | CA |
| 2014-12-02 | 510-598-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FRNK MAIN | CA |
| 2014-12-01 | 510-942-2XXX | 2000–2999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | RICHMOND | CA |
| 2014-12-01 | 510-942-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | RICHMOND | 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.