NumberResearchRecent thousands-block assignments
37 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026
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 657
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 |
|---|---|---|---|---|---|---|---|
| 2015-07-08 | 657-253-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | FULLERTON | CA |
| 2015-07-08 | 657-253-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | FULLERTON | CA |
| 2015-07-08 | 657-253-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | FULLERTON | CA |
| 2015-07-08 | 657-272-0XXX | 0000–0999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | ANAHEIM | CA |
| 2015-07-06 | 657-266-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-07-06 | 657-266-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-07-06 | 657-266-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-07-06 | 657-266-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-07-06 | 657-383-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-07-06 | 657-465-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | CYPRESS | CA |
| 2015-07-01 | 657-236-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ORANGE | CA |
| 2015-07-01 | 657-274-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ORANGE | CA |
| 2015-06-29 | 657-274-7XXX | 7000–7999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | ORANGE | CA |
| 2015-06-23 | 657-272-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-06-23 | 657-272-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-06-23 | 657-272-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-06-23 | 657-272-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-06-23 | 657-272-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-06-23 | 657-272-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-06-19 | 657-363-1XXX | 1000–1999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | YORBALINDA | CA |
| 2015-06-11 | 657-266-1XXX | 1000–1999 | Assigned | IP HORIZON LLC | 515J | SANTA ANA | CA |
| 2015-06-02 | 657-255-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BUENA PARK | CA |
| 2015-06-02 | 657-255-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | BUENA PARK | CA |
| 2015-06-02 | 657-263-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GARDEN GRV | CA |
| 2015-06-02 | 657-263-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GARDEN GRV | CA |
| 2015-06-02 | 657-263-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GARDEN GRV | CA |
| 2015-06-02 | 657-274-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ORANGE | CA |
| 2015-06-02 | 657-274-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ORANGE | CA |
| 2015-06-02 | 657-274-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ORANGE | CA |
| 2015-06-02 | 657-274-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | ORANGE | CA |
| 2015-06-02 | 657-465-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CYPRESS | CA |
| 2015-06-02 | 657-465-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CYPRESS | CA |
| 2015-06-02 | 657-465-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CYPRESS | CA |
| 2015-06-02 | 657-465-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CYPRESS | CA |
| 2015-06-01 | 657-234-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | YORBALINDA | CA |
| 2015-06-01 | 657-258-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLACENTIA | CA |
| 2015-06-01 | 657-258-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | PLACENTIA | CA |
| 2015-05-21 | 657-272-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-05-19 | 657-266-3XXX | 3000–3999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SANTA ANA | CA |
| 2015-05-13 | 657-266-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SANTA ANA | CA |
| 2015-05-11 | 657-230-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | ANAHEIM | CA |
| 2015-05-11 | 657-230-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | ANAHEIM | CA |
| 2015-05-11 | 657-230-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | ANAHEIM | CA |
| 2015-05-11 | 657-266-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA ANA | CA |
| 2015-05-11 | 657-266-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA ANA | CA |
| 2015-05-11 | 657-266-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA ANA | CA |
| 2015-05-05 | 657-271-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | WESTMINSTR | CA |
| 2015-05-05 | 657-271-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | WESTMINSTR | CA |
| 2015-05-05 | 657-271-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | WESTMINSTR | CA |
| 2015-05-05 | 657-271-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | WESTMINSTR | CA |
Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.