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 |
|---|---|---|---|---|---|---|---|
| 2017-10-10 | 831-632-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | CASTROVL | CA |
| 2017-10-10 | 831-674-7XXX | 7000–7999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | GREENFIELD | CA |
| 2017-10-10 | 831-675-5XXX | 5000–5999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | GONZALES | CA |
| 2017-10-10 | 831-789-9XXX | 9000–9999 | Assigned | CHARTER IP ENABLED SERVICES, LLC | 792K | SALINAS | CA |
| 2017-09-25 | 831-500-6XXX | 6000–6999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SALINAS | CA |
| 2017-09-18 | 831-276-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2017-09-18 | 831-276-6XXX | 6000–6999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2017-09-18 | 831-439-4XXX | 4000–4999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2017-09-18 | 831-613-0XXX | 0000–0999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2017-09-11 | 831-673-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HOLLISTER | CA |
| 2017-08-29 | 831-400-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2017-08-29 | 831-888-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SANTA CRUZ | CA |
| 2017-08-16 | 831-744-1XXX | 1000–1999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | GONZALES | CA |
| 2017-08-14 | 831-276-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2017-08-14 | 831-666-2XXX | 2000–2999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2017-08-07 | 831-887-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | MONTEREY | CA |
| 2017-07-26 | 831-453-4XXX | 4000–4999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | CASTROVL | CA |
| 2017-07-18 | 831-583-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2017-07-14 | 831-400-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2017-07-11 | 831-703-7XXX | 7000–7999 | Assigned | TELNYX LLC | 073H | BOULDERCRK | CA |
| 2017-07-10 | 831-268-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | FELTON | CA |
| 2017-07-10 | 831-532-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | BEN LOMOND | CA |
| 2017-06-29 | 831-276-0XXX | 0000–0999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | SALINAS | CA |
| 2017-06-28 | 831-276-1XXX | 1000–1999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2017-06-28 | 831-276-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | SALINAS | CA |
| 2017-06-27 | 831-673-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | HOLLISTER | CA |
| 2017-06-23 | 831-641-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2017-06-21 | 831-582-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2017-06-13 | 831-582-6XXX | 6000–6999 | Assigned | PEERLESS NETWORK OF CALIFORNIA, LLC - CA | 373F | MONTEREY | CA |
| 2017-05-31 | 831-257-8XXX | 8000–8999 | Assigned | TELNYX LLC | 073H | APTOS | CA |
| 2017-05-23 | 831-201-6XXX | 6000–6999 | Assigned | TELNYX LLC | 073H | SANTA CRUZ | CA |
| 2017-05-23 | 831-666-1XXX | 1000–1999 | Assigned | TELNYX LLC | 073H | WATSONVL | CA |
| 2017-05-19 | 831-201-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SANTA CRUZ | CA |
| 2017-05-16 | 831-666-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2017-05-09 | 831-498-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2017-05-05 | 831-201-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SANTA CRUZ | CA |
| 2017-04-20 | 831-273-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-4XXX | 4000–4999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-7XXX | 7000–7999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-20 | 831-273-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | SALINAS | CA |
| 2017-04-17 | 831-230-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | MONTEREY | CA |
| 2017-04-17 | 831-290-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | GONZALES | CA |
| 2017-04-17 | 831-302-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | SAN LUCAS | CA |
| 2017-04-17 | 831-315-2XXX | 2000–2999 | Assigned | ONVOY, LLC - CA | 649C | SOLEDAD | CA |
| 2017-04-17 | 831-525-9XXX | 9000–9999 | Assigned | ONVOY, LLC - CA | 649C | KING CITY | 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.