NumberResearch Membership · Data 09/19/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/19/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

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 951
LEVEL 3 COMMUNICATIONS, LLC - CA 166
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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2021-12-21 951-799-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT ANZA CA
2021-04-29 951-540-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LAKEVIEWNU CA
2017-10-20 951-449-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2017-06-09 951-524-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2017-04-12 951-416-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MIRA LOMA CA
2016-05-02 951-381-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2015-12-29 951-462-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2015-08-25 951-438-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT HEMT CA
2015-08-06 951-462-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2015-06-04 951-474-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT SNJC CA
2015-05-14 951-465-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2015-03-12 951-428-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMECULA CA
2014-11-20 951-397-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MURRIETA CA
2014-09-25 951-379-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2014-09-17 951-423-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2014-08-25 951-390-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT HEMT CA
2014-08-14 951-394-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2014-05-01 951-226-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELSINORE CA
2014-04-24 951-744-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT ANZA CA
2014-04-18 951-393-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2014-04-10 951-376-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARLINGTON CA
2014-04-03 951-972-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMECULA CA
2014-01-14 951-319-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MURRIETA CA
2013-12-23 951-435-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2013-11-26 951-666-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2013-10-08 951-384-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2013-06-13 951-374-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2013-03-07 951-267-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2012-10-25 951-335-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2012-09-17 951-383-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMECULA CA
2012-07-13 951-572-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2012-05-24 951-763-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT ANZA CA
2012-05-24 951-900-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2012-05-23 951-666-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2012-02-01 951-356-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2012-01-24 951-338-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMSCL CNY CA
2011-11-30 951-335-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 RIVERSIDE CA
2011-11-30 951-373-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARLINGTON CA
2011-11-28 951-846-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BANNING CA
2011-10-27 951-221-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2011-08-12 951-322-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PERRIS CA
2011-08-09 951-373-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARLINGTON CA
2011-08-05 951-291-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ELSINORE CA
2011-08-05 951-703-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MIRA LOMA CA
2011-07-21 951-309-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUN CITY CA
2011-07-14 951-356-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CORONA CA
2011-07-12 951-221-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORENO CA
2011-06-03 951-305-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT HEMT CA
2011-05-20 951-252-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEMECULA CA
2011-03-14 951-223-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 HEMT HMLD CA

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.