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 |
|---|---|---|---|---|---|---|---|
| 2021-07-01 | 831-453-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | CASTROVL | CA |
| 2021-07-01 | 831-684-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2021-07-01 | 831-699-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2021-07-01 | 831-699-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2021-07-01 | 831-732-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SAN ARDO | CA |
| 2021-07-01 | 831-785-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2021-07-01 | 831-785-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2021-07-01 | 831-830-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | CA |
| 2021-07-01 | 831-830-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | CA |
| 2021-06-30 | 831-785-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2021-06-30 | 831-785-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2021-06-28 | 831-597-5XXX | 5000–5999 | Assigned | COMMIO, LLC | 939H | SALINAS | CA |
| 2021-06-28 | 831-597-7XXX | 7000–7999 | Assigned | COMMIO, LLC | 939H | SALINAS | CA |
| 2021-06-28 | 831-597-8XXX | 8000–8999 | Assigned | COMMIO, LLC | 939H | SALINAS | CA |
| 2021-06-27 | 831-266-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | SANTA CRUZ | CA |
| 2021-06-27 | 831-336-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BEN LOMOND | CA |
| 2021-06-27 | 831-432-4XXX | 4000–4999 | Assigned | ONVOY SPECTRUM, LLC | 624H | BOULDERCRK | CA |
| 2021-06-27 | 831-666-3XXX | 3000–3999 | Assigned | ONVOY SPECTRUM, LLC | 624H | WATSONVL | CA |
| 2021-06-27 | 831-699-6XXX | 6000–6999 | Assigned | ONVOY SPECTRUM, LLC | 624H | FELTON | CA |
| 2021-06-23 | 831-271-0XXX | 0000–0999 | Assigned | TELNYX LLC | 073H | HOLLISTER | CA |
| 2021-06-09 | 831-628-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | TRES PINOS | CA |
| 2021-05-10 | 831-580-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | GONZALES | CA |
| 2021-05-10 | 831-580-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | GONZALES | CA |
| 2021-05-09 | 831-741-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CASTROVL | CA |
| 2021-05-08 | 831-266-2XXX | 2000–2999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | SANTA CRUZ | CA |
| 2021-04-30 | 831-844-6XXX | 6000–6999 | Assigned | TON80 COMMUNICATIONS, LLC | 516J | BIG SUR | CA |
| 2021-04-26 | 831-257-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | APTOS | CA |
| 2021-04-16 | 831-902-1XXX | 1000–1999 | Assigned | T-MOBILE USA, INC. | 6529 | HOLLISTER | CA |
| 2021-04-16 | 831-902-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | HOLLISTER | CA |
| 2021-04-13 | 831-231-9XXX | 9000–9999 | Assigned | ONVOY SPECTRUM, LLC | 624H | GREENFIELD | CA |
| 2021-04-13 | 831-304-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2021-04-13 | 831-304-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | GREENFIELD | CA |
| 2021-04-01 | 831-417-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2021-03-31 | 831-417-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SALINAS | CA |
| 2021-03-24 | 831-253-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-253-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2021-03-24 | 831-266-5XXX | 5000–5999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-24 | 831-266-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-24 | 831-266-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-24 | 831-266-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-24 | 831-266-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-22 | 831-576-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-22 | 831-621-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2021-03-22 | 831-854-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | 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.