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 734
LEVEL 3 COMMUNICATIONS, LLC - MI 127
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
2026-08-20 734-220-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PETERSBURG MI
2022-01-25 734-977-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SALINE MI
2020-08-26 734-519-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2020-07-14 734-519-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2020-07-14 734-802-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YPSILANTI MI
2020-05-05 734-356-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2020-05-04 734-601-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2020-03-20 734-356-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2019-12-12 734-492-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2015-09-30 734-773-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2015-07-28 734-881-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2014-09-30 734-585-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2014-05-21 734-436-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2013-10-08 734-872-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NEWPORT MI
2013-09-06 734-389-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2013-01-04 734-680-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2012-11-27 734-823-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DUNDEE MI
2012-08-21 734-249-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2012-02-17 734-343-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2012-02-17 734-343-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2012-02-03 734-720-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WYANDOTTE MI
2011-12-29 734-669-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2011-12-09 734-532-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROMULUS MI
2011-10-21 734-219-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YPSILANTI MI
2011-09-19 734-548-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2011-08-31 734-666-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2011-03-09 734-707-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2011-02-10 734-357-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PLYMOUTH MI
2008-08-01 734-329-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WAYNE MI
2008-07-15 734-547-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 YPSILANTI MI
2008-05-20 734-619-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2008-05-20 734-619-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ANN ARBOR MI
2008-05-07 734-992-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROMULUS MI
2008-02-05 734-301-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRENTON MI
2008-01-31 734-469-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2008-01-31 734-469-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2008-01-22 734-402-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2008-01-17 734-666-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LIVONIA MI
2007-11-20 734-648-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PINCKNEY MI
2007-08-20 734-396-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MANCHESTER MI
2007-08-02 734-648-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PINCKNEY MI
2007-07-17 734-230-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONROE MI
2007-07-17 734-244-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONROE MI
2007-06-21 734-726-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 DEXTER MI
2007-02-19 734-393-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LOSTPNNSUL MI
2006-11-08 734-607-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAMBERTVL MI
2006-09-19 734-265-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONROE MI
2006-09-19 734-265-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MONROE MI
2006-09-05 734-441-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ROCKWOOD MI
2006-08-24 734-382-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GREGORY MI

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.