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 408
LEVEL 3 COMMUNICATIONS, LLC - CA 262
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
2019-09-26 408-604-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2017-08-14 408-495-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2017-08-14 408-495-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2016-07-07 408-878-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2015-09-23 408-865-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2015-02-17 408-897-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SANANTONIO CA
2014-02-27 408-913-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2014-02-27 408-913-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2014-02-11 408-819-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2013-11-06 408-913-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2013-10-04 408-816-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2013-10-04 408-816-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2013-08-26 408-713-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GILROY CA
2013-07-10 408-831-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2013-06-19 408-831-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2013-05-28 408-610-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2013-05-21 408-831-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2013-05-15 408-560-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOS GATOS CA
2012-10-25 408-628-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2012-07-09 408-214-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MARTIN CA
2012-07-09 408-560-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOS GATOS CA
2012-07-09 408-606-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2012-07-09 408-606-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2012-07-09 408-763-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 MORGANHILL CA
2012-07-09 408-868-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2012-06-28 408-609-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2012-06-08 408-680-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2012-05-16 408-822-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2012-05-02 408-766-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS SOUTH CA
2012-02-15 408-601-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2012-02-10 408-214-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MARTIN CA
2012-02-10 408-872-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2012-02-01 408-638-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2012-02-01 408-638-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2011-12-08 408-703-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2011-10-27 408-502-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 LOS GATOS CA
2011-10-12 408-680-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2011-10-12 408-837-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MARTIN CA
2011-09-30 408-498-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2011-09-30 408-805-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SARATOGA CA
2011-09-16 408-956-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2011-08-05 408-412-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CAMPBELL CA
2011-07-21 408-713-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 GILROY CA
2011-06-16 408-212-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2011-06-16 408-675-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SUNNYVALE CA
2011-05-27 408-662-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH CA
2011-05-06 408-389-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS SOUTH CA
2011-05-04 408-703-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS WEST CA
2011-05-04 408-837-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SAN MARTIN CA
2011-04-07 408-883-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - CA 8826 SNJS NORTH 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.