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 |
|---|---|---|---|---|---|---|---|
| 2015-12-22 | 831-531-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2015-12-22 | 831-687-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2015-12-21 | 831-216-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2015-12-15 | 831-228-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2015-12-15 | 831-531-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2015-12-15 | 831-531-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2015-12-15 | 831-609-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2015-12-15 | 831-609-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | BEN LOMOND | CA |
| 2015-12-11 | 831-225-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SALINAS | CA |
| 2015-12-11 | 831-537-9XXX | 9000–9999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | HOLLISTER | CA |
| 2015-12-11 | 831-777-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2015-12-11 | 831-777-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2015-12-11 | 831-777-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2015-12-11 | 831-777-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2015-12-10 | 831-263-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | KING CITY | CA |
| 2015-12-01 | 831-200-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2015-11-23 | 831-777-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2015-11-17 | 831-228-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2015-11-16 | 831-888-8XXX | 8000–8999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2015-11-13 | 831-524-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HOLLISTER | CA |
| 2015-11-11 | 831-610-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2015-11-10 | 831-228-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2015-11-10 | 831-250-3XXX | 3000–3999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | CARMEL | CA |
| 2015-10-27 | 831-228-0XXX | 0000–0999 | Assigned | PAETEC ITEL, LLC | 829J | WATSONVL | CA |
| 2015-10-12 | 831-237-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SOLEDAD | CA |
| 2015-10-12 | 831-708-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | APTOS | CA |
| 2015-09-29 | 831-226-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SANTA CRUZ | CA |
| 2015-09-29 | 831-226-3XXX | 3000–3999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SANTA CRUZ | CA |
| 2015-09-29 | 831-226-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA CRUZ | CA |
| 2015-09-29 | 831-256-7XXX | 7000–7999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SALINAS | CA |
| 2015-09-29 | 831-884-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2015-09-28 | 831-222-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2015-09-21 | 831-228-1XXX | 1000–1999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | WATSONVL | CA |
| 2015-09-16 | 831-200-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | MONTEREY | CA |
| 2015-09-16 | 831-221-6XXX | 6000–6999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | SAN ARDO | CA |
| 2015-09-16 | 831-232-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | CHUALAR | CA |
| 2015-09-16 | 831-237-4XXX | 4000–4999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SOLEDAD | CA |
| 2015-09-16 | 831-244-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | BIG SUR | CA |
| 2015-09-16 | 831-244-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BIG SUR | CA |
| 2015-09-16 | 831-263-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | KING CITY | CA |
| 2015-09-16 | 831-278-5XXX | 5000–5999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | BEN LOMOND | CA |
| 2015-09-16 | 831-290-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GONZALES | CA |
| 2015-09-16 | 831-382-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAN LUCAS | CA |
| 2015-09-16 | 831-574-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CARMEL | CA |
| 2015-09-16 | 831-593-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAN JUAN | CA |
| 2015-09-16 | 831-613-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | GREENFIELD | CA |
| 2015-09-16 | 831-627-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | SAN ARDO | CA |
| 2015-09-16 | 831-652-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CARMEL VLY | CA |
| 2015-09-16 | 831-664-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | HOLLISTER | CA |
| 2015-09-16 | 831-705-7XXX | 7000–7999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | CHUALAR | 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.