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 253
LEVEL 3 COMMUNICATIONS, LLC - WA 78
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
2019-12-26 253-800-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2019-03-28 253-393-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2019-01-29 253-393-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2019-01-10 253-487-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
2018-08-23 253-999-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2018-06-15 253-525-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GIG HARBOR WA
2017-12-21 253-263-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
2015-09-17 253-432-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GIG HARBOR WA
2015-07-09 253-533-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2013-04-09 253-204-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
2013-04-09 253-231-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMAWVLY WA
2013-04-09 253-236-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
2012-09-14 253-231-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMAWVLY WA
2012-02-01 253-329-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
2012-01-11 253-321-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SUMNER WA
2012-01-11 253-336-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2012-01-09 253-442-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2011-12-22 253-215-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 ROY WA
2011-10-05 253-693-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
2011-09-12 253-655-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GRAHAM WA
2011-05-10 253-248-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMAWVLY WA
2011-05-10 253-336-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2011-05-09 253-348-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2011-05-04 253-343-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2011-04-23 253-358-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GIG HARBOR WA
2010-11-24 253-666-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2010-11-24 253-693-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
2010-11-03 253-218-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 AUBURN WA
2010-10-27 253-666-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2010-10-07 253-336-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2010-10-07 253-336-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2010-08-27 253-236-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
2010-02-02 253-214-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2009-11-06 253-313-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GIG HARBOR WA
2009-03-10 253-216-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
2008-07-16 253-237-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2008-07-16 253-693-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
2008-01-31 253-292-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2008-01-31 253-292-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2008-01-22 253-292-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2008-01-17 253-292-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2008-01-17 253-292-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2007-11-07 253-341-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2006-11-07 253-330-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2006-05-04 253-604-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
2005-10-19 253-214-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2005-10-05 253-267-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2005-10-05 253-267-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2005-10-05 253-534-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2005-10-05 253-534-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA

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.