NumberResearchRecent thousands-block assignments
13 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 831
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 |
|---|---|---|---|---|---|---|---|
| 2021-03-19 | 831-230-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-03-19 | 831-230-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-03-19 | 831-230-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-03-18 | 831-666-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2021-03-18 | 831-677-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | CA |
| 2021-03-17 | 831-884-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2021-03-17 | 831-884-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2021-03-15 | 831-243-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2021-03-15 | 831-243-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2021-03-01 | 831-529-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-01 | 831-529-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-01 | 831-529-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-01 | 831-889-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-01 | 831-889-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-02-22 | 831-274-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | WATSONVL | CA |
| 2021-02-22 | 831-348-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | WATSONVL | CA |
| 2021-02-22 | 831-830-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | KING CITY | CA |
| 2021-02-18 | 831-297-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | HOLLISTER | CA |
| 2021-02-18 | 831-529-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2021-02-11 | 831-718-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | MONTEREY | CA |
| 2021-02-05 | 831-231-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2021-02-05 | 831-231-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2021-02-05 | 831-652-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL VLY | CA |
| 2021-02-05 | 831-830-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | CA |
| 2021-02-05 | 831-830-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | CA |
| 2021-02-05 | 831-830-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | CA |
| 2021-02-05 | 831-830-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | CA |
| 2021-02-05 | 831-877-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | CARMEL | CA |
| 2021-01-28 | 831-204-4XXX | 4000–4999 | Assigned | TELNYX LLC | 073H | MONTEREY | CA |
| 2021-01-28 | 831-303-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | SAN ARDO | CA |
| 2021-01-28 | 831-667-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | BIG SUR | CA |
| 2021-01-27 | 831-243-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | SALINAS | CA |
| 2021-01-20 | 831-215-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-01-20 | 831-215-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-01-20 | 831-215-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-01-20 | 831-215-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2021-01-08 | 831-305-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | GONZALES | CA |
| 2021-01-07 | 831-356-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2021-01-07 | 831-356-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2020-12-22 | 831-432-8XXX | 8000–8999 | Assigned | FRACTEL, LLC | 965H | BOULDERCRK | CA |
| 2020-12-22 | 831-699-9XXX | 9000–9999 | Assigned | FRACTEL, LLC | 965H | FELTON | CA |
| 2020-12-15 | 831-382-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | SAN LUCAS | CA |
| 2020-12-15 | 831-632-6XXX | 6000–6999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CASTROVL | CA |
| 2020-12-15 | 831-659-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CARMEL VLY | CA |
| 2020-12-15 | 831-675-7XXX | 7000–7999 | Assigned | TERRA NOVA TELECOM INC. | 145J | GONZALES | CA |
| 2020-12-15 | 831-679-8XXX | 8000–8999 | Assigned | TERRA NOVA TELECOM INC. | 145J | CHUALAR | CA |
| 2020-12-15 | 831-854-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2020-12-08 | 831-336-4XXX | 4000–4999 | Assigned | TERRA NOVA TELECOM INC. | 145J | BEN LOMOND | CA |
| 2020-12-04 | 831-253-7XXX | 7000–7999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SALINAS | CA |
| 2020-11-27 | 831-677-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SOLEDAD | 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.