NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

0 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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 661
LEVEL 3 COMMUNICATIONS, LLC - CA 117
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
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2023-12-28 661-407-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2023-07-18 661-612-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2021-04-06 661-516-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2019-12-02 661-888-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2016-07-07 661-553-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2016-02-24 661-546-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2014-11-25 661-525-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2014-09-25 661-493-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2014-07-24 661-483-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LANCASTER CA
2014-04-04 661-425-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2014-03-19 661-769-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TAFT CA
2014-01-14 661-485-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PLDL PLDL CA
2013-12-04 661-426-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2013-10-17 661-430-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA SGCC CA
2013-10-04 661-777-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LEBEC CA
2013-10-04 661-829-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2013-09-11 661-776-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SHAFTER CA
2013-09-11 661-855-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARVIN CA
2013-09-05 661-418-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LANCASTER CA
2013-06-27 661-613-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 EDWARDS CA
2013-02-12 661-473-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD SOUTH CA
2013-02-06 661-600-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2013-01-16 661-584-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MOJAVE CA
2013-01-16 661-750-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 TEHACHAPI CA
2012-12-14 661-446-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2012-12-13 661-437-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2012-05-09 661-370-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2012-02-15 661-874-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LANCASTER CA
2011-12-15 661-673-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA SGCC CA
2011-11-30 661-261-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BIG BUTTE CA
2011-11-28 661-434-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 PLDL PLDL CA
2011-10-12 661-709-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2011-10-05 661-243-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2011-09-30 661-379-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2011-09-30 661-835-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD SOUTH CA
2011-09-12 661-430-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA SGCC CA
2011-08-05 661-888-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2011-07-21 661-368-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2011-06-16 661-800-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2011-03-14 661-474-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO CA
2010-11-30 661-412-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD SOUTH CA
2010-08-27 661-368-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2010-08-06 661-379-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2010-04-19 661-505-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2009-07-29 661-206-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LANCASTER CA
2009-07-29 661-903-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 ARVIN CA
2009-07-01 661-846-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD MAIN CA
2009-02-27 661-368-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 BKFD NORTH CA
2008-11-25 661-200-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNCA NHCS CA
2008-11-13 661-375-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 DELANO 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.