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 313
LEVEL 3 COMMUNICATIONS, LLC - MI 94
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
2021-02-02 313-380-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2020-12-16 313-756-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2020-08-19 313-512-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2020-08-19 313-512-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2020-08-19 313-512-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2020-08-11 313-263-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2020-03-25 313-464-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2020-03-03 313-710-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2019-05-29 313-484-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2019-04-30 313-774-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-11-14 313-771-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-09-21 313-771-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-08-24 313-725-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2018-08-24 313-725-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2017-09-28 313-329-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2017-06-14 313-426-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2017-01-31 313-426-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2016-12-07 313-752-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2016-06-22 313-335-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2015-11-18 313-398-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2014-09-30 313-329-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2014-07-25 313-960-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2014-02-07 313-263-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2013-08-09 313-265-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2013-06-26 313-214-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI
2011-08-17 313-456-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2011-07-26 313-455-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN3 MI
2011-05-26 313-528-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2011-05-05 313-208-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2011-03-30 313-437-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2011-03-04 313-202-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2010-11-16 313-437-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2010-11-16 313-437-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN4 MI
2010-11-16 313-499-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN2 MI
2010-11-16 313-499-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN2 MI
2010-11-16 313-528-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2010-11-16 313-528-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2010-11-16 313-528-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2010-11-16 313-925-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN2 MI
2010-10-26 313-528-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2010-10-26 313-528-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2010-10-26 313-925-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN2 MI
2010-07-16 313-202-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2010-04-23 313-221-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2008-07-15 313-731-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN3 MI
2008-07-15 313-918-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN1 MI
2008-07-07 313-749-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2008-07-07 313-908-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2008-07-07 313-908-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN6 MI
2008-05-06 313-681-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DETROITZN5 MI

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.