NumberResearchRecent thousands-block assignments
37 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 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 |
|---|---|---|---|---|---|---|---|
| 2015-03-24 | 657-265-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-03-24 | 657-265-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-03-24 | 657-265-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-03-24 | 657-265-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA ANA | CA |
| 2015-03-20 | 657-456-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | ANAHEIM | CA |
| 2015-03-20 | 657-465-3XXX | 3000–3999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7139 | CYPRESS | CA |
| 2015-03-17 | 657-699-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SANTA ANA | CA |
| 2015-03-17 | 657-699-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SANTA ANA | CA |
| 2015-03-17 | 657-699-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SANTA ANA | CA |
| 2015-03-13 | 657-223-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | ORANGE | CA |
| 2015-03-12 | 657-248-7XXX | 7000–7999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | FULLERTON | CA |
| 2015-03-09 | 657-258-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | PLACENTIA | CA |
| 2015-03-06 | 657-244-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNTITNBCH | CA |
| 2015-03-06 | 657-244-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | HUNTITNBCH | CA |
| 2015-03-06 | 657-456-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-06 | 657-456-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-03-03 | 657-383-9XXX | 9000–9999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SANTA ANA | CA |
| 2015-03-02 | 657-227-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WESTMINSTR | CA |
| 2015-02-25 | 657-227-5XXX | 5000–5999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | WESTMINSTR | CA |
| 2015-02-19 | 657-242-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-02-19 | 657-252-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | BUENA PARK | CA |
| 2015-02-19 | 657-252-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | BUENA PARK | CA |
| 2015-02-19 | 657-262-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-02-19 | 657-262-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-02-19 | 657-262-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-02-19 | 657-282-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | ORANGE | CA |
| 2015-02-17 | 657-227-3XXX | 3000–3999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | WESTMINSTR | CA |
| 2015-02-16 | 657-258-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | PLACENTIA | CA |
| 2015-02-13 | 657-261-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | SANTA ANA | CA |
| 2015-02-10 | 657-263-1XXX | 1000–1999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | GARDEN GRV | CA |
| 2015-02-10 | 657-263-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | GARDEN GRV | CA |
| 2015-02-10 | 657-263-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | GARDEN GRV | CA |
| 2015-02-09 | 657-256-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | CYPRESS | CA |
| 2015-02-09 | 657-256-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | CYPRESS | CA |
| 2015-02-09 | 657-262-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-02-05 | 657-252-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | BUENA PARK | CA |
| 2015-01-30 | 657-262-3XXX | 3000–3999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | ANAHEIM | CA |
| 2015-01-29 | 657-247-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA ANA | CA |
| 2015-01-29 | 657-247-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA ANA | CA |
| 2015-01-29 | 657-247-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA ANA | CA |
| 2015-01-16 | 657-256-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | CYPRESS | CA |
| 2015-01-16 | 657-256-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | CYPRESS | CA |
| 2015-01-16 | 657-262-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | CA |
| 2015-01-16 | 657-262-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | ANAHEIM | 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.