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 231
LEVEL 3 COMMUNICATIONS, LLC - MI 116
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
2023-02-13 231-381-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WHITECLOUD MI
2023-02-08 231-867-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CHIPPEWALK MI
2022-11-18 231-663-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MESICK MI
2022-04-20 231-257-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAKE CITY MI
2020-06-04 231-254-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 PETOSKEY MI
2020-06-04 231-900-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MUSKEGON MI
2020-04-07 231-600-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRAVERSECY MI
2019-12-23 231-279-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIG RAPIDS MI
2019-06-13 231-529-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BRUTUS MI
2019-05-24 231-203-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ALANSON MI
2019-05-23 231-545-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BOYNEFALLS MI
2019-05-23 231-626-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LEVERING MI
2017-08-30 231-440-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BALDWIN MI
2017-05-17 231-394-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MOORESTOWN MI
2017-05-17 231-640-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 LAKE ANN MI
2017-05-17 231-970-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BEAR LAKE MI
2016-07-05 231-263-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 KINGSLEY MI
2016-03-02 231-668-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRAVERSECY MI
2015-09-22 231-328-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MERRITT MI
2015-09-22 231-826-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FALMOUTH MI
2015-08-18 231-404-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 STANWOOD MI
2015-08-18 231-866-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SUTTONSBAY MI
2015-08-17 231-359-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MECOSTA MI
2015-08-13 231-340-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 ELMIRA MI
2015-08-12 231-227-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HONOR MI
2015-07-28 231-726-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MUSKEGON MI
2015-06-25 231-835-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 GLEN LAKE MI
2013-01-09 231-598-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BIG RAPIDS MI
2012-06-04 231-903-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MUSKEGON MI
2012-01-30 231-538-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FREMONT MI
2011-10-21 231-638-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MUSKEGON MI
2011-08-03 231-715-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRAVERSECY MI
2008-12-11 231-377-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CLAM RIVER MI
2008-11-03 231-432-3XXX 3000–3999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 NORTHPORT MI
2008-09-05 231-399-1XXX 1000–1999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FRANKFORT MI
2008-09-05 231-879-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 FIFE LAKE MI
2008-04-28 231-307-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MORLEY MI
2008-04-28 231-307-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MORLEY MI
2008-03-03 231-742-4XXX 4000–4999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HART MI
2008-02-14 231-259-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 SHELBY MI
2008-01-31 231-242-7XXX 7000–7999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 HARBOR SPG MI
2008-01-31 231-720-0XXX 0000–0999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MUSKEGON MI
2007-06-07 231-577-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CADILLAC MI
2007-04-20 231-668-9XXX 9000–9999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 TRAVERSECY MI
2007-03-22 231-930-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 BEULAH MI
2007-03-12 231-276-2XXX 2000–2999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 INTERLOCHN MI
2007-02-19 231-354-8XXX 8000–8999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CORAL MI
2007-02-08 231-237-5XXX 5000–5999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 CHARLEVOIX MI
2007-01-16 231-794-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 MANISTEE MI
2006-11-29 231-981-6XXX 6000–6999Assigned LEVEL 3 COMMUNICATIONS, LLC - MI 6120 WHITEHALL 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.