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 917
LEVEL 3 COMMUNICATIONS, LLC - NY 89
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
2018-10-26 917-594-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2018-10-26 917-594-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2018-10-26 917-594-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2018-08-07 917-985-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2018-08-07 917-985-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2015-06-16 917-900-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2015-06-16 917-900-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2013-03-06 917-563-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN09 NY
2013-01-30 917-242-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN04 NY
2012-05-22 917-525-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN15 NY
2012-03-20 917-831-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN14 NY
2012-01-30 917-259-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN03 NY
2012-01-30 917-525-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN15 NY
2011-12-30 917-551-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-12-30 917-790-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-12-30 917-790-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-12-13 917-580-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN04 NY
2011-12-08 917-688-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN03 NY
2011-12-08 917-688-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN03 NY
2011-11-22 917-521-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-22 917-521-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-22 917-551-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-11-01 917-746-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-10-14 917-525-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN15 NY
2011-10-14 917-746-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-10-14 917-746-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2011-03-04 917-563-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN09 NY
2010-11-03 917-387-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN12 NY
2010-10-08 917-382-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN08 NY
2010-10-08 917-382-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN08 NY
2010-10-08 917-382-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN08 NY
2010-08-02 917-243-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2010-05-24 917-267-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2008-07-08 917-832-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN08 NY
2008-04-21 917-284-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2008-03-10 917-477-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN03 NY
2008-03-03 917-675-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2008-03-03 917-675-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2008-01-21 917-267-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2007-10-15 917-267-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2007-09-12 917-267-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2007-05-23 917-388-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY
2007-05-23 917-388-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN01 NY

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.