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 |
|---|---|---|---|---|---|---|---|
| 2006-05-05 | 831-676-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2006-05-04 | 831-630-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | HOLLISTER | CA |
| 2006-04-07 | 831-609-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | BEN LOMOND | CA |
| 2006-04-03 | 831-454-8XXX | 8000–8999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SANTA CRUZ | CA |
| 2006-04-03 | 831-703-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | BOULDERCRK | CA |
| 2006-04-03 | 831-704-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | FELTON | CA |
| 2006-04-03 | 831-708-2XXX | 2000–2999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | APTOS | CA |
| 2006-04-03 | 831-726-8XXX | 8000–8999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | WATSONVL | CA |
| 2006-03-28 | 831-737-1XXX | 1000–1999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SALINAS | CA |
| 2006-03-14 | 831-250-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL | CA |
| 2006-03-14 | 831-298-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | CARMEL VLY | CA |
| 2006-03-14 | 831-620-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CARMEL | CA |
| 2006-03-14 | 831-652-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | CARMEL VLY | CA |
| 2006-03-14 | 831-667-7XXX | 7000–7999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | BIG SUR | CA |
| 2006-03-14 | 831-676-3XXX | 3000–3999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SALINAS | CA |
| 2006-03-08 | 831-295-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SANTA CRUZ | CA |
| 2006-03-08 | 831-539-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | WATSONVL | CA |
| 2006-03-07 | 831-431-7XXX | 7000–7999 | Assigned | METROPCS, INC. | 5562 | SANTA CRUZ | CA |
| 2006-03-03 | 831-512-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2006-02-17 | 831-383-5XXX | 5000–5999 | Assigned | UTILITY TELECOM GROUP, LLC - CA | 9262 | MONTEREY | CA |
| 2006-02-14 | 831-324-0XXX | 0000–0999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | MONTEREY | CA |
| 2006-02-07 | 831-512-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2006-02-07 | 831-512-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2006-02-07 | 831-902-2XXX | 2000–2999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | HOLLISTER | CA |
| 2006-02-02 | 831-740-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | WATSONVL | CA |
| 2006-01-24 | 831-707-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2006-01-13 | 831-600-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA CRUZ | CA |
| 2006-01-13 | 831-600-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA CRUZ | CA |
| 2005-12-29 | 831-440-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2005-12-29 | 831-440-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2005-12-29 | 831-440-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SANTA CRUZ | CA |
| 2005-12-16 | 831-392-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2005-12-16 | 831-392-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2005-12-16 | 831-512-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2005-12-13 | 831-216-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | FELTON | CA |
| 2005-12-13 | 831-703-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | BOULDERCRK | CA |
| 2005-12-13 | 831-708-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | APTOS | CA |
| 2005-12-13 | 831-740-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2005-12-06 | 831-578-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SALINAS | CA |
| 2005-11-22 | 831-216-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | FELTON | CA |
| 2005-11-11 | 831-512-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SALINAS | CA |
| 2005-11-09 | 831-707-2XXX | 2000–2999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | WATSONVL | CA |
| 2005-11-02 | 831-392-5XXX | 5000–5999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | MONTEREY | CA |
| 2005-11-02 | 831-454-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SANTA CRUZ | CA |
| 2005-11-02 | 831-726-6XXX | 6000–6999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | WATSONVL | CA |
| 2005-11-01 | 831-460-5XXX | 5000–5999 | Assigned | TELEPORT COMMUNICATIONS AMERICA, LLC - CA | 7145 | SANTA CRUZ | CA |
| 2005-10-28 | 831-786-5XXX | 5000–5999 | Assigned | ONVOY, LLC - CA | 649C | WATSONVL | CA |
| 2005-10-24 | 831-223-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | SOLEDAD | CA |
| 2005-10-24 | 831-613-3XXX | 3000–3999 | Assigned | METROPCS, INC. | 5562 | GREENFIELD | CA |
| 2005-10-20 | 831-707-5XXX | 5000–5999 | Assigned | METROPCS, INC. | 5562 | WATSONVL | 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.