NumberResearchRecent thousands-block assignments
0 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, all time — NPA 858
New assignments by month
Sep 2026
Aug 2026
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Oct 2025
| Assigned | Thousands-block | Last 4 digits | Status | Assignee | OCN | Rate center | State |
|---|---|---|---|---|---|---|---|
| 2016-01-14 | 858-262-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG LVTA | CA |
| 2016-01-14 | 858-262-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG LVTA | CA |
| 2016-01-14 | 858-262-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG LVTA | CA |
| 2016-01-14 | 858-262-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG LVTA | CA |
| 2015-05-28 | 858-291-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2014-09-12 | 858-291-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2014-06-23 | 858-281-7XXX | 7000–7999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2014-04-23 | 858-369-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2014-01-22 | 858-465-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2014-01-22 | 858-465-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2013-11-20 | 858-223-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG LVTA | CA |
| 2012-04-12 | 858-529-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2012-04-12 | 858-529-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2011-06-02 | 858-255-6XXX | 6000–6999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2011-04-28 | 858-255-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2009-09-04 | 858-429-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG LVTA | CA |
| 2008-12-18 | 858-222-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-12-10 | 858-480-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2007-12-10 | 858-617-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2007-11-13 | 858-246-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-11-13 | 858-246-9XXX | 9000–9999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-07-03 | 858-246-0XXX | 0000–0999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-07-03 | 858-246-1XXX | 1000–1999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-07-03 | 858-246-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-07-03 | 858-246-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-07-03 | 858-246-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-07-03 | 858-246-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2007-04-20 | 858-617-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2007-04-20 | 858-617-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2007-04-20 | 858-617-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2007-04-20 | 858-617-5XXX | 5000–5999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | DEL MAR | CA |
| 2006-02-10 | 858-784-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | CA |
| 2005-04-25 | 858-805-2XXX | 2000–2999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG MRMS | CA |
| 2005-04-25 | 858-805-3XXX | 3000–3999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG MRMS | CA |
| 2005-04-25 | 858-805-4XXX | 4000–4999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG MRMS | CA |
| 2005-04-25 | 858-805-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG MRMS | CA |
| 2005-04-25 | 858-805-9XXX | 9000–9999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | SNDG MRMS | CA |
| 2005-04-06 | 858-736-8XXX | 8000–8999 | Assigned | LEVEL 3 TELECOM OF CALIFORNIA, LP - CA | 7718 | LA JOLLA | 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.