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 |
|---|---|---|---|---|---|---|---|
| 2006-06-07 | 858-527-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2006-06-07 | 858-527-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2006-06-07 | 858-926-8XXX | 8000–8999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LA JOLLA | CA |
| 2006-06-07 | 858-926-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | LA JOLLA | CA |
| 2006-06-05 | 858-842-4XXX | 4000–4999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | POWAY | CA |
| 2006-06-01 | 858-731-8XXX | 8000–8999 | Assigned | U.S. TELEPACIFIC CORP. DBA TPX COMMUNICATIONS | 671J | LA JOLLA | CA |
| 2006-05-31 | 858-952-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2006-05-24 | 858-356-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | DEL MAR | CA |
| 2006-05-18 | 858-240-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RNCHOPNQTS | CA |
| 2006-05-17 | 858-353-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | DEL MAR | CA |
| 2006-05-16 | 858-737-4XXX | 4000–4999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNDG LVTA | CA |
| 2006-05-15 | 858-352-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | LA JOLLA | CA |
| 2006-05-04 | 858-952-7XXX | 7000–7999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | LA JOLLA | CA |
| 2006-04-10 | 858-444-5XXX | 5000–5999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2006-04-10 | 858-444-6XXX | 6000–6999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2006-04-10 | 858-444-7XXX | 7000–7999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | SNDG MRMS | CA |
| 2006-03-30 | 858-952-9XXX | 9000–9999 | Assigned | METROPCS, INC. | 5562 | LA JOLLA | CA |
| 2006-03-28 | 858-240-2XXX | 2000–2999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RNCHOPNQTS | CA |
| 2006-03-28 | 858-380-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2006-03-28 | 858-947-5XXX | 5000–5999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | DEL MAR | CA |
| 2006-03-10 | 858-365-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RNCHOPNQTS | CA |
| 2006-03-10 | 858-397-2XXX | 2000–2999 | Assigned | AT&T ENTERPRISES, LLC | 516C | SNDG MRMS | CA |
| 2006-03-10 | 858-524-6XXX | 6000–6999 | Assigned | AT&T ENTERPRISES, LLC | 516C | RNCHOBRNDO | CA |
| 2006-03-09 | 858-925-7XXX | 7000–7999 | Assigned | AT&T ENTERPRISES, LLC | 516C | DEL MAR | CA |
| 2006-03-07 | 858-436-4XXX | 4000–4999 | Assigned | T-MOBILE USA, INC. | 6529 | DEL MAR | CA |
| 2006-02-28 | 858-201-9XXX | 9000–9999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2006-02-10 | 858-784-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2006-02-09 | 858-472-9XXX | 9000–9999 | Assigned | CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA | 6006 | RNCHOBRNDO | CA |
| 2006-01-25 | 858-380-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2006-01-24 | 858-952-4XXX | 4000–4999 | Assigned | NEW CINGULAR WIRELESS PCS, LLC | 6010 | LA JOLLA | CA |
| 2006-01-15 | 858-754-2XXX | 2000–2999 | Assigned | PAETEC ITEL, LLC | 829J | LA JOLLA | CA |
| 2006-01-11 | 858-461-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | DEL MAR | CA |
| 2006-01-04 | 858-952-2XXX | 2000–2999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2006-01-04 | 858-952-3XXX | 3000–3999 | Assigned | T-MOBILE USA, INC. | 6529 | LA JOLLA | CA |
| 2006-01-03 | 858-312-5XXX | 5000–5999 | Assigned | COMCAST PHONE OF CALIFORNIA, LLC | 394L | RNCHOBRNDO | CA |
| 2005-12-21 | 858-427-6XXX | 6000–6999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNDG LVTA | CA |
| 2005-12-21 | 858-427-7XXX | 7000–7999 | Assigned | MCIMETRO ACCESS TRANSMISSION SERVICES LLC - CA | 7240 | SNDG LVTA | CA |
| 2005-12-19 | 858-952-0XXX | 0000–0999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LA JOLLA | CA |
| 2005-12-19 | 858-952-1XXX | 1000–1999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LA JOLLA | CA |
| 2005-12-07 | 858-225-6XXX | 6000–6999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNDG MRMS | CA |
| 2005-12-07 | 858-225-7XXX | 7000–7999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNDG MRMS | CA |
| 2005-12-07 | 858-225-8XXX | 8000–8999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | SNDG MRMS | CA |
| 2005-11-22 | 858-216-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RNCHOPNQTS | CA |
| 2005-11-22 | 858-367-5XXX | 5000–5999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RNCHOSANFE | CA |
| 2005-11-21 | 858-201-8XXX | 8000–8999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG MRMS | CA |
| 2005-11-21 | 858-207-7XXX | 7000–7999 | Assigned | T-MOBILE USA, INC. | 6529 | RNCHOBRNDO | CA |
| 2005-11-21 | 858-380-6XXX | 6000–6999 | Assigned | T-MOBILE USA, INC. | 6529 | SNDG LVTA | CA |
| 2005-11-16 | 858-736-9XXX | 9000–9999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | LA JOLLA | CA |
| 2005-11-11 | 858-207-3XXX | 3000–3999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RNCHOBRNDO | CA |
| 2005-11-11 | 858-207-4XXX | 4000–4999 | Assigned | LEVEL 3 COMMUNICATIONS, LLC - CA | 8826 | RNCHOBRNDO | 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.