NumberResearchRecent thousands-block assignments
25 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 858
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 |
|---|---|---|---|---|---|---|---|
| 2015-08-12 | 858-265-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2015-08-12 | 858-265-3XXX | 3000–3999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2015-08-12 | 858-265-4XXX | 4000–4999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2015-08-12 | 858-265-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2015-08-12 | 858-716-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RNCHOBRNDO | CA |
| 2015-08-06 | 858-257-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LA JOLLA | CA |
| 2015-07-29 | 858-261-0XXX | 0000–0999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | DEL MAR | CA |
| 2015-07-29 | 858-265-6XXX | 6000–6999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | SNDG MRMS | CA |
| 2015-07-24 | 858-291-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LA JOLLA | CA |
| 2015-07-22 | 858-987-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | SNDG LVTA | CA |
| 2015-07-17 | 858-257-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LA JOLLA | CA |
| 2015-07-17 | 858-257-1XXX | 1000–1999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | LA JOLLA | CA |
| 2015-07-07 | 858-265-7XXX | 7000–7999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNDG MRMS | CA |
| 2015-07-07 | 858-265-8XXX | 8000–8999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNDG MRMS | CA |
| 2015-07-07 | 858-265-9XXX | 9000–9999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | SNDG MRMS | CA |
| 2015-06-30 | 858-312-0XXX | 0000–0999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | RNCHOBRNDO | CA |
| 2015-06-23 | 858-291-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2015-06-22 | 858-226-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2015-06-11 | 858-295-0XXX | 0000–0999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2015-06-11 | 858-295-1XXX | 1000–1999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2015-06-11 | 858-295-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2015-06-11 | 858-295-6XXX | 6000–6999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2015-06-08 | 858-376-6XXX | 6000–6999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | RNCHOBRNDO | CA |
| 2015-06-01 | 858-923-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOSANFE | CA |
| 2015-05-28 | 858-291-5XXX | 5000–5999 | Assigned | CENTURYLINK COMMUNICATIONS, LLC | 508J | LA JOLLA | CA |
| 2015-05-28 | 858-291-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2015-05-21 | 858-247-5XXX | 5000–5999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | LA JOLLA | CA |
| 2015-05-19 | 858-262-2XXX | 2000–2999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | SNDG LVTA | CA |
| 2015-05-11 | 858-716-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RNCHOBRNDO | CA |
| 2015-04-23 | 858-413-3XXX | 3000–3999 | Assigned | PAETEC ITEL, LLC | 829J | POWAY | CA |
| 2015-04-23 | 858-927-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOBRNDO | CA |
| 2015-04-22 | 858-295-2XXX | 2000–2999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LA JOLLA | CA |
| 2015-04-22 | 858-295-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LA JOLLA | CA |
| 2015-04-22 | 858-432-1XXX | 1000–1999 | Assigned | TWC IP ENABLED SERVICES, LLC | 793K | RNCHOBRNDO | CA |
| 2015-04-21 | 858-206-8XXX | 8000–8999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | POWAY | CA |
| 2015-04-21 | 858-206-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | POWAY | CA |
| 2015-04-21 | 858-218-0XXX | 0000–0999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | POWAY | CA |
| 2015-04-21 | 858-375-9XXX | 9000–9999 | Assigned | BANDWIDTH.COM CLEC, LLC - CA | 981E | POWAY | CA |
| 2015-04-20 | 858-987-0XXX | 0000–0999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNDG LVTA | CA |
| 2015-04-13 | 858-257-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2015-04-13 | 858-257-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2015-04-13 | 858-257-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2015-03-27 | 858-428-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOPNQTS | CA |
| 2015-03-26 | 858-247-3XXX | 3000–3999 | Assigned | ONVOY, LLC - CA | 649C | LA JOLLA | CA |
| 2015-03-17 | 858-295-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | LA JOLLA | CA |
| 2015-03-12 | 858-262-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2015-03-12 | 858-262-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2015-03-12 | 858-262-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2015-03-06 | 858-842-0XXX | 0000–0999 | Assigned | T-MOBILE USA, INC. | 6529 | POWAY | CA |
| 2015-02-27 | 858-266-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNDG LVTA | 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.